Kienan Stewart [Mon, 15 Apr 2024 13:25:26 +0000 (09:25 -0400)] 
Fix: timer_expire_entry changed in 4.19.312
See upstream commit:
commit
bbb5b1c060d73ca96ccc8cceaa81f5e1a96e8fa4
Author: Anna-Maria Gleixner <anna-maria@linutronix.de>
Date: Thu Mar 21 13:09:21 2019 +0100
timer/trace: Improve timer tracing
[ Upstream commit
f28d3d5346e97e60c81f933ac89ccf015430e5cf ]
Timers are added to the timer wheel off by one. This is required in
case a timer is queued directly before incrementing jiffies to prevent
early timer expiry.
When reading a timer trace and relying only on the expiry time of the timer
in the timer_start trace point and on the now in the timer_expiry_entry
trace point, it seems that the timer fires late. With the current
timer_expiry_entry trace point information only now=jiffies is printed but
not the value of base->clk. This makes it impossible to draw a conclusion
to the index of base->clk and makes it impossible to examine timer problems
without additional trace points.
Therefore add the base->clk value to the timer_expire_entry trace
point, to be able to calculate the index the timer base is located at
during collecting expired timers.
Change-Id: I2ebdbb637db0966ff51f45bf66916a59a496b50c
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 25 Mar 2024 14:53:46 +0000 (10:53 -0400)]
Fix: dev_base_lock removed in linux 6.9-rc1
See upstream commit:
commit
1b3ef46cb7f2618cc0b507393220a69810f6da12
Author: Eric Dumazet <edumazet@google.com>
Date: Tue Feb 13 06:32:45 2024 +0000
net: remove dev_base_lock
dev_base_lock is not needed anymore, all remaining users also hold RTNL.
Change-Id: I6b07e6eed07fd398302ca14d23162ed24d74df15
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 25 Mar 2024 14:30:32 +0000 (10:30 -0400)]
Fix: mm_compaction_migratepages changed in linux 6.9-rc1
See upstream commit:
commit
ab755bf4249b992fc2140d615ab0a686d50765b4
Author: Baolin Wang <baolin.wang@linux.alibaba.com>
Date: Tue Feb 20 14:16:31 2024 +0800
mm: compaction: update the cc->nr_migratepages when allocating or freeing the freepages
Currently we will use 'cc->nr_freepages >= cc->nr_migratepages' comparison
to ensure that enough freepages are isolated in isolate_freepages(),
however it just decreases the cc->nr_freepages without updating
cc->nr_migratepages in compaction_alloc(), which will waste more CPU
cycles and cause too many freepages to be isolated.
So we should also update the cc->nr_migratepages when allocating or
freeing the freepages to avoid isolating excess freepages. And I can see
fewer free pages are scanned and isolated when running thpcompact on my
Arm64 server:
k6.7 k6.7_patched
Ops Compaction pages isolated
120692036.00
118160797.00
Ops Compaction migrate scanned
131210329.00
154093268.00
Ops Compaction free scanned
1090587971.00
1080632536.00
Ops Compact scan efficiency 12.03 14.26
Moreover, I did not see an obvious latency improvements, this is likely
because isolating freepages is not the bottleneck in the thpcompact test
case.
k6.7 k6.7_patched
Amean fault-both-1 1089.76 ( 0.00%) 1080.16 * 0.88%*
Amean fault-both-3 1616.48 ( 0.00%) 1636.65 * -1.25%*
Amean fault-both-5 2266.66 ( 0.00%) 2219.20 * 2.09%*
Amean fault-both-7 2909.84 ( 0.00%) 2801.90 * 3.71%*
Amean fault-both-12 4861.26 ( 0.00%) 4733.25 * 2.63%*
Amean fault-both-18 7351.11 ( 0.00%) 6950.51 * 5.45%*
Amean fault-both-24 9059.30 ( 0.00%) 9159.99 * -1.11%*
Amean fault-both-30 10685.68 ( 0.00%) 11399.02 * -6.68%*
Change-Id: I103a43fd1b549360b3fc978fd409b7c17ef3e192
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 25 Mar 2024 13:40:29 +0000 (09:40 -0400)]
Fix: ASoC add component to set_bias_level events in linux 6.9-rc1
See upstream commit:
commit
6ef46a69ec32fe1cf56de67742fcd01af4bf48af
Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
Date: Wed Mar 6 10:30:00 2024 +0100
ASoC: trace: add component to set_bias_level trace events
The snd_soc_bias_level_start and snd_soc_bias_level_done trace events
currently look like:
aplay-229 [000] 1250.140778: snd_soc_bias_level_start: card=vscn-2046 val=1
aplay-229 [000] 1250.140784: snd_soc_bias_level_done: card=vscn-2046 val=1
aplay-229 [000] 1250.140786: snd_soc_bias_level_start: card=vscn-2046 val=2
aplay-229 [000] 1250.140788: snd_soc_bias_level_done: card=vscn-2046 val=2
kworker/u8:1-21 [000] 1250.140871: snd_soc_bias_level_start: card=vscn-2046 val=1
kworker/u8:0-11 [000] 1250.140951: snd_soc_bias_level_start: card=vscn-2046 val=1
kworker/u8:0-11 [000] 1250.140956: snd_soc_bias_level_done: card=vscn-2046 val=1
kworker/u8:0-11 [000] 1250.140959: snd_soc_bias_level_start: card=vscn-2046 val=2
kworker/u8:0-11 [000] 1250.140961: snd_soc_bias_level_done: card=vscn-2046 val=2
kworker/u8:1-21 [000] 1250.167219: snd_soc_bias_level_done: card=vscn-2046 val=1
kworker/u8:1-21 [000] 1250.167222: snd_soc_bias_level_start: card=vscn-2046 val=2
kworker/u8:1-21 [000] 1250.167232: snd_soc_bias_level_done: card=vscn-2046 val=2
kworker/u8:0-11 [000] 1250.167440: snd_soc_bias_level_start: card=vscn-2046 val=3
kworker/u8:0-11 [000] 1250.167444: snd_soc_bias_level_done: card=vscn-2046 val=3
kworker/u8:1-21 [000] 1250.167497: snd_soc_bias_level_start: card=vscn-2046 val=3
kworker/u8:1-21 [000] 1250.167506: snd_soc_bias_level_done: card=vscn-2046 val=3
There are clearly multiple calls, one per component, but they cannot be
discriminated from each other.
Change the ftrace events to also print the component name, to make it clear
which part of the code is involved. This requires changing the passed value
from a struct snd_soc_card, where the DAPM context is not kwown, to a
struct snd_soc_dapm_context where it is obviously known but the a card
pointer is also available.
With this change, the resulting trace becomes:
aplay-247 [000] 1436.357332: snd_soc_bias_level_start: card=vscn-2046 component=(none) val=1
aplay-247 [000] 1436.357338: snd_soc_bias_level_done: card=vscn-2046 component=(none) val=1
aplay-247 [000] 1436.357340: snd_soc_bias_level_start: card=vscn-2046 component=(none) val=2
aplay-247 [000] 1436.357343: snd_soc_bias_level_done: card=vscn-2046 component=(none) val=2
kworker/u8:4-215 [000] 1436.357437: snd_soc_bias_level_start: card=vscn-2046 component=
ff560000.codec val=1
kworker/u8:5-231 [000] 1436.357518: snd_soc_bias_level_start: card=vscn-2046 component=
ff320000.i2s val=1
kworker/u8:5-231 [000] 1436.357523: snd_soc_bias_level_done: card=vscn-2046 component=
ff320000.i2s val=1
kworker/u8:5-231 [000] 1436.357526: snd_soc_bias_level_start: card=vscn-2046 component=
ff320000.i2s val=2
kworker/u8:5-231 [000] 1436.357528: snd_soc_bias_level_done: card=vscn-2046 component=
ff320000.i2s val=2
kworker/u8:4-215 [000] 1436.383217: snd_soc_bias_level_done: card=vscn-2046 component=
ff560000.codec val=1
kworker/u8:4-215 [000] 1436.383221: snd_soc_bias_level_start: card=vscn-2046 component=
ff560000.codec val=2
kworker/u8:4-215 [000] 1436.383231: snd_soc_bias_level_done: card=vscn-2046 component=
ff560000.codec val=2
kworker/u8:5-231 [000] 1436.383468: snd_soc_bias_level_start: card=vscn-2046 component=
ff320000.i2s val=3
kworker/u8:5-231 [000] 1436.383472: snd_soc_bias_level_done: card=vscn-2046 component=
ff320000.i2s val=3
kworker/u8:4-215 [000] 1436.383503: snd_soc_bias_level_start: card=vscn-2046 component=
ff560000.codec val=3
kworker/u8:4-215 [000] 1436.383513: snd_soc_bias_level_done: card=vscn-2046 component=
ff560000.codec val=3
Change-Id: I959f1680c002acdf29828b968d3975247f5433d8
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 25 Mar 2024 12:54:42 +0000 (08:54 -0400)]
Fix: ASoC snd_doc_dapm on linux 6.9-rc1
See upstream commit:
commit
7df3eb4cdb6bbfa482f51548b9fd47c2723c68ba
Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
Date: Wed Mar 6 10:30:01 2024 +0100
ASoC: trace: add event to snd_soc_dapm trace events
Add the event value to the snd_soc_dapm_start and snd_soc_dapm_done trace
events to make them more informative.
Trace before:
aplay-229 [000] 250.140309: snd_soc_dapm_start: card=vscn-2046
aplay-229 [000] 250.167531: snd_soc_dapm_done: card=vscn-2046
aplay-229 [000] 251.169588: snd_soc_dapm_start: card=vscn-2046
aplay-229 [000] 251.195245: snd_soc_dapm_done: card=vscn-2046
Trace after:
aplay-214 [000] 693.290612: snd_soc_dapm_start: card=vscn-2046 event=1
aplay-214 [000] 693.315508: snd_soc_dapm_done: card=vscn-2046 event=1
aplay-214 [000] 694.537349: snd_soc_dapm_start: card=vscn-2046 event=2
aplay-214 [000] 694.563241: snd_soc_dapm_done: card=vscn-2046 event=2
Change-Id: If0d33544b8dd1dfb3d12ca9390892190fc0444b0
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Fri, 22 Mar 2024 13:28:08 +0000 (09:28 -0400)]
Fix: build kvm probe on EL 8.4+
The lower value of the EL range, 240.15.1, corresponds to the first
import of EL r8 kernels into Rocky Linux's kernel staging repo.
The change may have been introduced in an earlier RHEL 8 kernel,
prior to the history of imports into Rocky.
Change-Id: Icefe472d43e28cc09746e9e046b12299609ebab1
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Fri, 22 Mar 2024 13:55:55 +0000 (09:55 -0400)]
Fix: support ext4_journal_start on EL 8.4+
The lower value of the EL range, 240.15.1, corresponds to the first
import of EL r8 kernels into Rocky Linux's kernel staging repo.
The change may have been introduced in an earlier RHEL 8 kernel,
prior to the history of imports into Rocky.
Change-Id: Ibec02b382478bee33947d079f33835823827f4c5
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Thu, 21 Mar 2024 19:16:29 +0000 (15:16 -0400)]
Fix: correct RHEL range for kmem_cache_free define
When compiling against RHEL 8.5 kernels, lttng-modules builds fail
with the following error:
```
lttng-modules/src/probes/../../include/lttng/tracepoint-event-impl.h:133:6: error: conflicting types for ‘trace_kmem_
cache_free’; have ‘void(long unsigned int, const void *)’
```
The original range was introduced in commit
89d917153fc52c1e5b0ddabf8ee078897656b263 which tested against RHEL 8.6
and not RHEL 8.5.
Change-Id: Icff98c15415ce8e1e95a10974cd65ed6e84cd00a
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 21 Mar 2024 19:45:34 +0000 (15:45 -0400)] 
Version 2.13.12
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I448e493bbf064587e3b717a9f5c41c13f0569f29
Kienan Stewart [Thu, 14 Mar 2024 15:37:05 +0000 (11:37 -0400)]
docs: Add supported versions and fix-backport policy
Change-Id: I5d6da21b9541f838cb326263eff8c1448e37fc55
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Fri, 24 Nov 2023 15:09:46 +0000 (10:09 -0500)]
docs: Add links to project resources
Indicate that Gerrit (https://review.lttng.org) is the principal place
where patches are submitted and reviewed, rather than the mailing list.
Based on feedback received on the mailing list:
https://lists.lttng.org/pipermail/lttng-dev/2023-November/030670.html
Change-Id: I611deeec26393fc25c9a103c022687198100df0c
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Fri, 8 Mar 2024 17:47:06 +0000 (12:47 -0500)]
Fix: Correct minimum version in jbd2 SLE kernel range
This range was introduced in commit
b49650509ff072d37ec112cf45a5f14f382c9a31;
however, the range is wrong and worked because the kernel versions
(eg. `5.14.21-150400.24.100-default`) were evaluated to values
greater than `LTTNG_SLE_KERNEL_RANGE(5,14,21,24,46,1)`.
As a result builds of lttng-modules against older versions of SLE
kernels failed.
Change-Id: I23d97d84a23c7b24e957fe943932d6aefbe1b409
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Fri, 8 Mar 2024 16:26:02 +0000 (11:26 -0500)]
Fix: Handle recent SLE major version codes
Starting in early 2022, the SLE linux version codes changed from the
previous style `5.3.18-59.40.1` to a new convention in which the major
version is a compound number consisting of the major release version,
the service pack version, and the auxillary version (currently unused
from my understanding) similar to the following `5.3.18-150300.59.43.1`[1].
The newer values used in the SLE major version causes the integer
value to "overflow" the expected number of digits and the comparisons
may fail. The `LTTNG_SLE_KERNEL_VERSION` macro also multiplies the
`LTTNG_KERNEL_VERSION` by `100000000ULL` which doesn't work in all
situations, as the resulting value is too large to be stored fully in
an `unsigned long long`.
Example of previous results:
```
// Example range comparison. True or false depending on the value of
// `LTTNG_SLE_VERSION_CODE` and `LTTNG_LINUX_VERSION_CODE`.
LTTNG_SLE_KERNEL_RANGE(5,15,21,150400,24,46, 5,15,0,0,0,0);
// Note: values printed with `%ull`
LTTNG_SLE_KERNEL_VERSION(5,15,21,24,26,1); //
6106486698364570153
LTTNG_SLE_KERNEL_VERSION(5,15,0,0,0,0); // 0
LTTNG_KERNEL_VERSION(5,15,0); //
84869120
// Corrected SLE version codes
LTTNG_SLE_KERNEL_VERSION(5,14,21,150400,24,26); //
14918348902249793914
LTTNG_SLE_KERNEL_VERSION(5,14,21,150400,24,46); //
14918348902249793934
LTTNG_SLE_KERNEL_VERSION(5,15,0,150400,0,0)); //
6971507145825058816
```
`LTTNG_KERNEL_VERSION` packs the kernel version into a 32-bit integer;
however, using that type of packing on the SLE kernel version will not
work well:
* Major: `150400` needs 18 bits
* Minor: may exceed 127, requires 8 bits (eg. `4.12.14-150100.197.148.1`)
* Patch: may exceed 127, requires 8 bits (eg. `5.3.18-150300.59.124.1`)
In this patch, the SLE version is packed into a 64-bit integer
with 48 bits for the major version, 8 bits for each of the minor and
patch versions.
As a result of packing the SLE version into a 64-bit integer,
it is not possible to coherently combine an `LTTNG_KERNEL_VERSION` and
an `LTTNG_SLE_KERNEL_VERSION`. Doing so would require an integer
larger than 64-bits. Therefore, the `LTTNG_SLE_KERNEL_RANGE` macro has
been adjusted to perform the range comparisons using the two values
separately. The usage of the `LTTNG_SLE_KERNEL_RANGE` remains
unchanged, as `LTTNG_SLE_VERSION` is only used inside that macro.
Using the adjusted macros:
```
// Example range comparison. True or false depending on the value of
// `LTTNG_SLE_VERSION_CODE` and `LTTNG_LINUX_VERSION_CODE`.
LTTNG_SLE_KERNEL_RANGE(5,15,21,150400,24,46, 5,15,0,0,0,0);
// Note: values printed with `%ull`
LTTNG_SLE_VERSION(24,26,1); //
1579521
LTTNG_SLE_VERSION(0,0,0); // 0
LTTNG_KERNEL_VERSION(5,15,0); //
84869120
// Corrected SLE version codes
LTTNG_SLE_VERSION(150400,24,26); //
9856620570
LTTNG_SLE_VERSION(150400,24,46); //
9856620590
LTTNG_SLE_VERSION(150400,0,0)); //
9863168000
```
Known drawbacks
===============
It's possible that future releases of SLE kernels have minor or patch
values that exceed 255 (SLE15SP1 has a release using `197`, for example),
requiring an adjustment to using more bits for those fields when
packing into a 64-bit integer.
The schema of multiplying an `LTTNG_KERNEL_VERSION` by a large value
is used for other distributions. RHEL in particular uses
`100000000ULL`, which could lead to overflow issues with certain
comparisons similar to the previous behaviour of
`LTTNG_SLE_KERNEL_VERSION(5,15,0,0,0,0);`.
[1]: https://www.suse.com/support/kb/doc/?id=
000019587#SLE15SP4
Change-Id: Iaa90bfa422e47213a13829cdf008ab20d7484cab
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Tue, 27 Feb 2024 16:47:58 +0000 (11:47 -0500)]
Fix: build on sles15sp4
Introduced in 5.14.21-150400.46.1.
See SLE commit:
commit
96a814b6c528f45fc92bf8e6de90ad8923511091
Author: Petr Pavlu <petr.pavlu@suse.com>
Date: Tue Jan 24 14:52:24 2023 +0100
jbd2: use the correct print format (git-fixes).
suse-commit:
34db311bec3ca4388b82b2355eed7c08b25f5a2e
Change-Id: Ic267b9498b7f9a4a814514ff82f9226f844c133f
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Martin Hicks [Fri, 26 Jan 2024 17:18:33 +0000 (12:18 -0500)] 
Compile fixes for RHEL 9.3 kernels
The ranges were build tested on RHEL9.2 (5.14.0-284.11.1), RHEL9.3
(5.14.0-362.8.1) and RHEL8.9 (4.18.0-513.11.1).
This disables the kmem and compaction modules. I don't believe getting
these to compile will be easy, as the required struct declarations are
in vmlinux.h, and haven't been moved into mm/internal.h and mm/slab.h in
the RHEL sources.
Change-Id: I999c593d6850e2327f6e9df8432a4ea2325a7cea
Signed-off-by: Martin Hicks <martin@sr-research.com>
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 5 Feb 2024 13:52:29 +0000 (08:52 -0500)]
Fix: ext4_discard_preallocations changed in linux 6.8.0-rc3
See upstream commit:
commit
f0e54b6087de9571ec61c189d6c378b81edbe3b2
Author: Kemeng Shi <shikemeng@huaweicloud.com>
Date: Fri Jan 5 17:21:02 2024 +0800
ext4: remove 'needed' in trace_ext4_discard_preallocations
As 'needed' to trace_ext4_discard_preallocations is always 0 which
is meaningless. Just remove it.
Change-Id: Ib6b698ca553c4beebd4ca791c83bbbb927901758
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 22 Jan 2024 18:13:36 +0000 (13:13 -0500)]
Fix: btrfs_get_extent flags and compress_type changed in linux 6.8.0-rc1
See upstream commit:
commit
f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9
Author: Filipe Manana <fdmanana@suse.com>
Date: Mon Dec 4 16:20:33 2023 +0000
btrfs: use the flags of an extent map to identify the compression type
Currently, in struct extent_map, we use an unsigned int (32 bits) to
identify the compression type of an extent and an unsigned long (64 bits
on a 64 bits platform, 32 bits otherwise) for flags. We are only using
6 different flags, so an unsigned long is excessive and we can use flags
to identify the compression type instead of using a dedicated 32 bits
field.
We can easily have tens or hundreds of thousands (or more) of extent maps
on busy and large filesystems, specially with compression enabled or many
or large files with tons of small extents. So it's convenient to have the
extent_map structure as small as possible in order to use less memory.
So remove the compression type field from struct extent_map, use flags
to identify the compression type and shorten the flags field from an
unsigned long to a u32. This saves 8 bytes (on 64 bits platforms) and
reduces the size of the structure from 136 bytes down to 128 bytes, using
now only two cache lines, and increases the number of extent maps we can
have per 4K page from 30 to 32. By using a u32 for the flags instead of
an unsigned long, we no longer use test_bit(), set_bit() and clear_bit(),
but that level of atomicity is not needed as most flags are never cleared
once set (before adding an extent map to the tree), and the ones that can
be cleared or set after an extent map is added to the tree, are always
performed while holding the write lock on the extent map tree, while the
reader holds a lock on the tree or tests for a flag that never changes
once the extent map is in the tree (such as compression flags).
Change-Id: I95402d43f064c016b423b48652e4968d3db9b8a9
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 22 Jan 2024 17:17:33 +0000 (12:17 -0500)]
Fix: btrfs_chunk tracepoints changed in linux 6.8.0-rc1
See upstream commit:
commit
7dc66abb5a47778d7db327783a0ba172b8cff0b5
Author: Filipe Manana <fdmanana@suse.com>
Date: Tue Nov 21 13:38:38 2023 +0000
btrfs: use a dedicated data structure for chunk maps
Currently we abuse the extent_map structure for two purposes:
1) To actually represent extents for inodes;
2) To represent chunk mappings.
This is odd and has several disadvantages:
1) To create a chunk map, we need to do two memory allocations: one for
an extent_map structure and another one for a map_lookup structure, so
more potential for an allocation failure and more complicated code to
manage and link two structures;
2) For a chunk map we actually only use 3 fields (24 bytes) of the
respective extent map structure: the 'start' field to have the logical
start address of the chunk, the 'len' field to have the chunk's size,
and the 'orig_block_len' field to contain the chunk's stripe size.
Besides wasting a memory, it's also odd and not intuitive at all to
have the stripe size in a field named 'orig_block_len'.
We are also using 'block_len' of the extent_map structure to contain
the chunk size, so we have 2 fields for the same value, 'len' and
'block_len', which is pointless;
3) When an extent map is associated to a chunk mapping, we set the bit
EXTENT_FLAG_FS_MAPPING on its flags and then make its member named
'map_lookup' point to the associated map_lookup structure. This means
that for an extent map associated to an inode extent, we are not using
this 'map_lookup' pointer, so wasting 8 bytes (on a 64 bits platform);
4) Extent maps associated to a chunk mapping are never merged or split so
it's pointless to use the existing extent map infrastructure.
So add a dedicated data structure named 'btrfs_chunk_map' to represent
chunk mappings, this is basically the existing map_lookup structure with
some extra fields:
1) 'start' to contain the chunk logical address;
2) 'chunk_len' to contain the chunk's length;
3) 'stripe_size' for the stripe size;
4) 'rb_node' for insertion into a rb tree;
5) 'refs' for reference counting.
This way we do a single memory allocation for chunk mappings and we don't
waste memory for them with unused/unnecessary fields from an extent_map.
We also save 8 bytes from the extent_map structure by removing the
'map_lookup' pointer, so the size of struct extent_map is reduced from
144 bytes down to 136 bytes, and we can now have 30 extents map per 4K
page instead of 28.
Change-Id: Ie52b5ac83df4bc6abeb84d958c4f5d24ae0d8c75
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 22 Jan 2024 16:47:40 +0000 (11:47 -0500)]
Fix: strlcpy removed in linux 6.8.0-rc1
See upstream commit:
commit
d26270061ae66b915138af7cd73ca6f8b85e6b44
Author: Kees Cook <keescook@chromium.org>
Date: Thu Jan 18 12:31:55 2024 -0800
string: Remove strlcpy()
With all the users of strlcpy() removed[1] from the kernel, remove the
API, self-tests, and other references. Leave mentions in Documentation
(about its deprecation), and in checkpatch.pl (to help migrate host-only
tools/ usage). Long live strscpy().
The replacement interface, `strscpy`, has been available since linux
4.3, introduced in the upstream commit
30c44659f4a3e7e1f9f47e895591b4b40bf62671.
As lttng-modules master branch targets linux 4.4+ at this time,
`strlcpy` can be replaced with `strscpy`.
Change-Id: I27cdff70a504b25340cc59150ed8e959d9629e43
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 22 Jan 2024 16:33:39 +0000 (11:33 -0500)]
Fix: timer_start changed in linux 6.8.0-rc1
See upstream commit
commit
dbcdcb62b59db2cf6a24113873b90da15c6f0b19
Author: Anna-Maria Behnsen <anna-maria@linutronix.de>
Date: Fri Dec 1 10:26:26 2023 +0100
tracing/timers: Enhance timer_start tracepoint
For starting a timer, the timer is enqueued into a bucket of the timer
wheel. The bucket expiry is the defacto expiry of the timer but it is not
equal the timer expiry because of increasing granularity when bucket is in
a higher level of the wheel. To be able to figure out in a trace whether a
timer expired in time or not, the bucket expiry time is required as well.
Add bucket expiry time to the timer_start tracepoint and thereby simplify
the arguments.
Change-Id: I4868092765745b1efd0c48f13c0b837f2007dcb6
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 22 Jan 2024 16:10:37 +0000 (11:10 -0500)]
Fix: sched_stat_runtime changed in linux 6.8.0-rc1
See upstream commit:
commit
5fe6ec8f6ab549b6422e41551abb51802bd48bc7
Author: Peter Zijlstra <peterz@infradead.org>
Date: Mon Nov 6 13:41:43 2023 +0100
sched: Remove vruntime from trace_sched_stat_runtime()
Tracing the runtime delta makes sense, observer can sum over time.
Tracing the absolute vruntime makes less sense, inconsistent:
absolute-vs-delta, but also vruntime delta can be computed from
runtime delta.
Removing the vruntime thing also makes the two tracepoint sites
identical, allowing to unify the code in a later patch.
Change-Id: I24ebb4e06dbb646a1af75ac62b74f3821ff197de
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Wed, 10 Jan 2024 20:35:48 +0000 (15:35 -0500)]
Version 2.13.11
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0f91343f361271cc5b51f5fade12c7cc7ed90da4
Mathieu Desnoyers [Wed, 10 Jan 2024 01:55:58 +0000 (20:55 -0500)]
Fix: Include linux/sched/rt.h for kernels v3.9 to v3.14
From kernel v3.0 to v3.8, MAX_RT_PRIO is defined in linux/sched.h.
From kernel v3.9 to v3.14, MAX_RT_PRIO is defined in linux/sched/rt.h,
which is not included by linux/sched.h (hence this work-around).
From kernel v3.15 onwards, MAX_RT_PRIO is defined in linux/sched/prio.h,
which is included by linux/sched.h.
Add the missing linux/sched/rt.h include for the affected kernel version
range.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie7e1d9dc710621deca04553a9b5ba7f9a4d83c15
Mathieu Desnoyers [Mon, 8 Jan 2024 18:31:04 +0000 (13:31 -0500)]
Fix: Disable IBT around indirect function calls
When the Intel IBT feature is enabled, a CPU supporting this feature
validates that all indirect jumps/calls land on an ENDBR64 instruction.
The kernel seals functions which are not meant to be called indirectly,
which means that calling functions indirectly from their address fetched
using kallsyms or kprobes trigger a crash.
Use the MSR_IA32_S_CET CET_ENDBR_EN MSR bit to temporarily disable ENDBR
validation around indirect calls to kernel functions. Considering that
the main purpose of this feature is to prevent ROP-style attacks,
disabling the ENDBR validation temporarily around the call from a kernel
module does not affect the ROP protection.
Fixes #1408
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I97f5d8efce093c1e956cede1f44de2fcebf30227
Mathieu Desnoyers [Tue, 9 Jan 2024 15:36:31 +0000 (10:36 -0500)]
Inline implementation of task_prio()
The task_prio() function has been implemented as "return p->prio -
MAX_RT_PRIO;" since at least kernel v3.0, so inline it into
lttng-modules rather than using kallsyms to call the kernel
implementation.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I7dd482a2da72a005c16b3e5864767b47d7bc3fd3
Mathieu Desnoyers [Tue, 9 Jan 2024 15:33:13 +0000 (10:33 -0500)]
Fix: prio context NULL pointer exception
A missing call to wrapper_task_prio_init() causes the function pointer
for task_prio to stay NULL, which triggers a OOPS when trying to use the
prio context.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I417e84cb8a07db624e682c7ec2c033fbc2a7b8e7
Mathieu Desnoyers [Mon, 18 Dec 2023 18:17:07 +0000 (13:17 -0500)]
Fix: MODULE_IMPORT_NS is introduced in kernel 5.4
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I4c5faafb3a3ff8178b45c0e411113b17643bbc78
Lei wang [Mon, 18 Dec 2023 10:16:33 +0000 (05:16 -0500)] 
Android: Import VFS namespace for android common kernel
Android GKI kernel add limitation on fs interface usage.
Need to import VFS namespace explicitly to make it workable
for lttng-modules.
Signed-off-by: Lei wang <quic_leiwan@quicinc.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 1 Dec 2023 14:52:08 +0000 (09:52 -0500)]
Fix: get_file_rcu is missing in kernels < 4.1
Open-code the get_file_rcu using atomic_long_inc_not_zero() for kernel
versions < 4.1.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0fa905b078165ede8b1837bb8d77891d05d0e8ed
Kienan Stewart [Mon, 20 Nov 2023 16:34:40 +0000 (11:34 -0500)]
fix: lookup_fd_rcu replaced by lookup_fdget_rcu in linux 6.7.0-rc1
See upstream commit:
commit
0ede61d8589cc2d93aa78230d74ac58b5b8d0244
Author: Christian Brauner <brauner@kernel.org>
Date: Fri Sep 29 08:45:59 2023 +0200
file: convert to SLAB_TYPESAFE_BY_RCU
In recent discussions around some performance improvements in the file
handling area we discussed switching the file cache to rely on
SLAB_TYPESAFE_BY_RCU which allows us to get rid of call_rcu() based
freeing for files completely. This is a pretty sensitive change overall
but it might actually be worth doing.
The main downside is the subtlety. The other one is that we should
really wait for Jann's patch to land that enables KASAN to handle
SLAB_TYPESAFE_BY_RCU UAFs. Currently it doesn't but a patch for this
exists.
With SLAB_TYPESAFE_BY_RCU objects may be freed and reused multiple times
which requires a few changes. So it isn't sufficient anymore to just
acquire a reference to the file in question under rcu using
atomic_long_inc_not_zero() since the file might have already been
recycled and someone else might have bumped the reference.
In other words, callers might see reference count bumps from newer
users. For this reason it is necessary to verify that the pointer is the
same before and after the reference count increment. This pattern can be
seen in get_file_rcu() and __files_get_rcu().
In addition, it isn't possible to access or check fields in struct file
without first aqcuiring a reference on it. Not doing that was always
very dodgy and it was only usable for non-pointer data in struct file.
With SLAB_TYPESAFE_BY_RCU it is necessary that callers first acquire a
reference under rcu or they must hold the files_lock of the fdtable.
Failing to do either one of this is a bug.
Thanks to Jann for pointing out that we need to ensure memory ordering
between reallocations and pointer check by ensuring that all subsequent
loads have a dependency on the second load in get_file_rcu() and
providing a fixup that was folded into this patch.
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Change-Id: Iba3663f19a54820afd31a8eeec24b3b5d4b06589
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Kienan Stewart [Mon, 20 Nov 2023 16:33:14 +0000 (11:33 -0500)]
fix: mm, vmscan signatures changed in linux 6.7.0-rc1
See upstream commit:
commit
3dfbb555c98ac55b9d911f9af0e35014b445fb41
Author: Vlastimil Babka <vbabka@suse.cz>
Date: Thu Sep 14 15:16:39 2023 +0200
mm, vmscan: remove ISOLATE_UNMAPPED
This isolate_mode_t flag is effectively unused since
89f6c88a6ab4 ("mm:
__isolate_lru_page_prepare() in isolate_migratepages_block()") as
sc->may_unmap is now checked directly (and only node_reclaim has a mode
that sets it to 0). The last remaining place is mm_vmscan_lru_isolate
tracepoint for the isolate_mode parameter. That one was mainly used to
indicate the active/inactive mode, which the trace-vmscan-postprocess.pl
script consumed, but that got silently broken. After fixing the script by
the previous patch, it does not need the isolate_mode anymore. So just
remove the parameter and with that the whole ISOLATE_UNMAPPED flag.
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie7346886d926a1a9d20bcb1570c587c5e943a1c3
Kienan Stewart [Mon, 20 Nov 2023 16:27:12 +0000 (11:27 -0500)]
fix: phys_proc_id and cpu_core_id moved in linux 6.7.0-rc1
See upstream commit:
commit
02fb601d27a7abf60d52b21bdf5b100a8d63da3f
Author: Thomas Gleixner <tglx@linutronix.de>
Date: Mon Aug 14 10:18:30 2023 +0200
x86/cpu: Move phys_proc_id into topology info
Rename it to pkg_id which is the terminology used in the kernel.
No functional change.
See upstream commit:
commit
e95256335d45cc965cd12c423535002974313340
Author: Thomas Gleixner <tglx@linutronix.de>
Date: Mon Aug 14 10:18:34 2023 +0200
x86/cpu: Move cpu_core_id into topology info
Rename it to core_id and stick it to the other ID fields.
No functional change.
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I574b02430210d5bb72c4b9db901d0e3a6dc7bea0
Kienan Stewart [Mon, 16 Oct 2023 14:10:09 +0000 (10:10 -0400)]
Fix build for RHEL 8.8 with linux 4.18.0-477.10.1+
4.18.0-477.10.1 introduces backports a change which updates the
`kfree_skb` trace event to the 3-argument version used in more recent
kernel versions.
Change-Id: I5a1071a59659b76e1499beae3388159ca8ced1f7
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Jérémie Galarneau [Thu, 5 Oct 2023 21:02:57 +0000 (17:02 -0400)] 
Fix: bytecode validator: oops during validation of immediate string
Issue observed
--------------
Running Linux 6.5.5, lttng-modules @
6be48c9f, all built with gcc
13.2.1, I got a 'BUG' in dmesg while enabling the following event
rule:
$ lttng enable-event --kernel --syscall --channel chanK --all --filter '$ctx.procname == "UST reg*"'
The relevant parts of the 'BUG' output follow:
[ +0.715480] detected buffer overflow in strnlen
[ +0.000001] kernel BUG at lib/string_helpers.c:1031!
[ +0.000008] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[ +0.000003] CPU: 2 PID: 157174 Comm: Client manageme Tainted: G S U OE 6.5.5-arch1-1 #1
d82a0f532dd8cfe67d5795c1738d9c01059a0c62
[ +0.000001] RIP: 0010:fortify_panic+0x13/0x20
[ +0.000006] Code: 41 5d c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 fe 48 c7 c7 90 22 c8 86 e8 3d aa b1 ff <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
[ +0.000002] RSP: 0018:
ffffa7c7c106f918 EFLAGS:
00010246
[ +0.000002] RAX:
0000000000000023 RBX:
000000000000000b RCX:
0000000000000000
[ +0.000002] RDX:
0000000000000000 RSI:
ffff92766e4a16c0 RDI:
ffff92766e4a16c0
[ +0.000001] RBP:
0000000000000000 R08:
0000000000000000 R09:
ffffa7c7c106f7c0
[ +0.000001] R10:
0000000000000003 R11:
ffffffff874ca068 R12:
ffff927618202480
[ +0.000001] R13:
ffff9276182024d2 R14:
ffff927453999c08 R15:
ffff9273dc7aa478
[ +0.000001] FS:
00007f06553f9680(0000) GS:
ffff92766e480000(0000) knlGS:
0000000000000000
[ +0.000002] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
[ +0.000002] CR2:
0000556d54eceaa8 CR3:
00000001ad9de002 CR4:
00000000003706e0
[ +0.000001] Call Trace:
[ +0.000002] <TASK>
[ +0.000002] ? die+0x36/0x90
[ +0.000004] ? do_trap+0xda/0x100
[ +0.000003] ? fortify_panic+0x13/0x20
[ +0.000002] ? do_error_trap+0x6a/0x90
[ +0.000002] ? fortify_panic+0x13/0x20
[ +0.000002] ? exc_invalid_op+0x50/0x70
[ +0.000003] ? fortify_panic+0x13/0x20
[ +0.000002] ? asm_exc_invalid_op+0x1a/0x20
[ +0.000005] ? fortify_panic+0x13/0x20
[ +0.000002] ? fortify_panic+0x13/0x20
[ +0.000003] bytecode_validate_overflow+0x155/0x1f0 [lttng_tracer
759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
[ +0.000330] lttng_bytecode_validate_load+0x32/0x1e0 [lttng_tracer
759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
[ +0.000183] lttng_enabler_link_bytecode+0x135/0x5a0 [lttng_tracer
759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
[ +0.000132] lttng_sync_event_list+0xef/0x650 [lttng_tracer
759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
[ +0.000123] ? __wake_up_common+0x73/0x180
[ +0.000004] lttng_session_enable+0x3e/0x130 [lttng_tracer
759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
[ +0.000121] lttng_session_ioctl+0x5db/0x720 [lttng_tracer
759e3e4fee0e774ef575e93b67e8dc7955d0c2c2]
[ +0.000120] ? __slab_free+0xf1/0x330
[ +0.000004] ? __scm_recv_common.isra.0+0x144/0x180
[ +0.000004] ? unix_stream_read_generic+0x233/0xb60
[ +0.000006] __x64_sys_ioctl+0x94/0xd0
[ +0.000004] do_syscall_64+0x5d/0x90
[ +0.000004] ? switch_fpu_return+0x50/0xe0
[ +0.000004] ? exit_to_user_mode_prepare+0x132/0x1e0
[ +0.000003] ? syscall_exit_to_user_mode+0x2b/0x40
[ +0.000002] ? do_syscall_64+0x6c/0x90
[ +0.000003] ? do_syscall_64+0x6c/0x90
[ +0.000002] ? do_syscall_64+0x6c/0x90
[ +0.000002] ? do_syscall_64+0x6c/0x90
[ +0.000002] ? syscall_exit_to_user_mode+0x2b/0x40
[ +0.000002] ? do_syscall_64+0x6c/0x90
[ +0.000002] ? do_syscall_64+0x6c/0x90
[ +0.000002] ? do_syscall_64+0x6c/0x90
[ +0.000002] ? do_syscall_64+0x6c/0x90
[ +0.000002] ? exc_page_fault+0x7f/0x180
[ +0.000003] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
Cause
-----
`struct load_op` has a trailing 0-length array `data` member that is
used to refer, in the context of BYTECODE_OP_LOAD_STAR_GLOB_STRING, to
an immediate string operand that follows it.
During the validation of a filtering bytecode, strnlen is properly used
to determine the size of the immediate string operand, with a `maxlen`
parameter that is used to ensure the string operand is contained within
the bytecode (see lttng-bytecode-validator.c:434).
However, recent KSPP-related changes have enabled additional overrun
checks when statically-sized and flexible arrays are used. Those are
enabled when the kernel is built with CONFIG_UBSAN_BOUNDS and/or
CONFIG_FORTIFY_SOURCE configured.
The KBUILD CFLAGS now contain `-fstrict-flex-arrays=3`, which is
recognized by gcc 13+[1] and allows proper coverage of dynamically sized
trailing arrays when those configuration options are used.
With those validations in place, the kernel assumes that the `data`
array is truly of length 0 and it BUGs to warn of an invalid access.
The commit linked above contains a number of links explaining the
rationale for transitioning uses of the trailing zero-length arrays (a
gcc extension) to C99 flexible array members (FAM).
This was discussed at this year's GNU Cauldron [2].
Solution
--------
Uses of zero-length arrays (`foo[0]`) are replaced by flexible array
members (`foo[]`). The only cases that are left untouched are those
where the zero-length array is used to indicate the end of a
structure (i.e. it doesn't indicate that a variable number of elements
follow), see the `metadata_packet_header`, `metadata_record_header`,
`event_notifier_packet_header`, and `event_notifier_record_header`
structures.
It may be desirable to use the new `counted_by` attribute for some of
those in the future (`lttng_kernel_abi_filter_bytecode`,
`lttng_kernel_abi_capture_bytecode`, and `bytecode_runtime`) [3].
Note
----
While this is tagged as a memory handling 'fix', it has no security
implication as far as I can tell. The accesses that are flagged by the
new validations were valid.
This merely allows the runtime validations to understand the memory
layout properly.
[1] https://github.com/torvalds/linux/commit/
df8fc4e934c12b906d08050d7779f292b9c5c6b5
[2] https://gcc.gnu.org/wiki/cauldron2023talks?action=AttachFile&do=get&target=Most-wanted+Security+Features+in+GCC+for+Linux+Kernel.pdf
[3] https://lwn.net/Articles/930943/
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Id39b101aaafe68f8fae6b86cd61806cba8cb1e6a
Kienan Stewart [Tue, 26 Sep 2023 18:45:09 +0000 (14:45 -0400)]
fix: lttng-probe-kvm-x86-mmu build with linux 6.6
A small change was made upstream in `spte.h` that requires
`arch/x86/kvm` to be added to the search path when
building lttng-probe-kvm.x86-mmu.o.
See upstream commit :
commit
d10f3780bc2f80744d291e118c0c8bade54ed3b8
Author: Sean Christopherson <seanjc@google.com>
Date: Tue Aug 8 15:40:59 2023 -0700
KVM: x86/mmu: Include mmu.h in spte.h
Explicitly include mmu.h in spte.h instead of relying on the "parent" to
include mmu.h. spte.h references a variety of macros and variables that
are defined/declared in mmu.h, and so including spte.h before (or instead
of) mmu.h will result in build errors, e.g.
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I5c3fc87d3b006cefbcca198e6e15868a342cb8dd
Michael Jeanson [Fri, 18 Aug 2023 15:28:30 +0000 (11:28 -0400)] 
fix: built-in lttng with kernel >= v6.1
In kernel v6.1 the list of subdirectories was moved from Makefile to
Kbuild. Adjust our built-in.sh script to detect this change and use the
appropriate file to graft ourself to the kernel build system.
Thanks to Richa Bharti for the initial patch.
See upstream commit:
commit
5750121ae7382ebac8d47ce6d68012d6cd1d7926
Author: Masahiro Yamada <masahiroy@kernel.org>
Date: Sun Sep 25 03:19:10 2022 +0900
kbuild: list sub-directories in ./Kbuild
Use the ordinary obj-y syntax to list subdirectories.
Change-Id: Ifc0f1bdea5ee59b0e0b96cdb31c9c689deb20559
Reported-by: Richa Bharti <Richa.Bharti@siemens.com>
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Fri, 7 Jul 2023 17:27:15 +0000 (13:27 -0400)]
fix: ubuntu kinetic kernel range for jdb2
Kinetic introduces a 'lowlatency' kernel with a different ABI number
than the 'generic' flavor, add 2 ranges accordingly.
Change-Id: I89427e30672f3f25b2f6d698d6e1cabfb45d9366
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Wed, 7 Jun 2023 14:53:24 +0000 (10:53 -0400)]
Version 2.13.10
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I9d1d358ba28dd0f9f68b54c52e784d002d9bc74c
Michael Jeanson [Fri, 14 Apr 2023 19:09:25 +0000 (15:09 -0400)]
Add support for RHEL 9.1
Change-Id: I2aaa8e385448b1e46c3c16edc4f36f2eb6906e76
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 19 Jul 2022 19:07:22 +0000 (15:07 -0400)]
Add support for RHEL 9.0
Change-Id: Ia01527c3d6243805445734f00f4f2f945efd16e7
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 29 Nov 2022 17:10:17 +0000 (12:10 -0500)]
fix: kallsyms wrapper on CONFIG_PPC64_ELF_ABI_V1
Change-Id: Ibdff5792a1511b678f7776f5d032758db739c5ad
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 7 Mar 2023 16:10:26 +0000 (11:10 -0500)]
fix: net: add location to trace_consume_skb() (v6.3)
See upstream commit :
commit
dd1b527831a3ed659afa01b672d8e1f7e6ca95a5
Author: Eric Dumazet <edumazet@google.com>
Date: Thu Feb 16 15:47:18 2023 +0000
net: add location to trace_consume_skb()
kfree_skb() includes the location, it makes sense
to add it to consume_skb() as well.
Change-Id: I8d871187d90e7fe113a63e209b00aebe0df475f3
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 7 Mar 2023 16:26:25 +0000 (11:26 -0500)]
fix: btrfs: pass find_free_extent_ctl to allocator tracepoints (v6.3)
See upstream commit :
commit
cfc2de0fce015d4249c674ef9f5e0b4817ba5c53
Author: Boris Burkov <boris@bur.io>
Date: Thu Dec 15 16:06:31 2022 -0800
btrfs: pass find_free_extent_ctl to allocator tracepoints
The allocator tracepoints currently have a pile of values from ffe_ctl.
In modifying the allocator and adding more tracepoints, I found myself
adding to the already long argument list of the tracepoints. It makes it
a lot simpler to just send in the ffe_ctl itself.
Change-Id: Iab4132a9d3df3a6369591a50fb75374b1e399fa4
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 7 Mar 2023 17:05:00 +0000 (12:05 -0500)]
fix: uuid: Decouple guid_t and uuid_le types and respective macros (v6.3)
See upstream commit :
commit
5e6a51787fef20b849682d8c49ec9c2beed5c373
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Tue Jan 24 15:38:38 2023 +0200
uuid: Decouple guid_t and uuid_le types and respective macros
The guid_t type and respective macros are being used internally only.
The uuid_le has its user outside the kernel. Decouple these types and
macros, and make guid_t completely internal type to the kernel.
Change-Id: I8644fd139b0630e9cf18886b84e33bffab1e5abd
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 7 Mar 2023 16:41:14 +0000 (11:41 -0500)]
fix: mm: introduce vma->vm_flags wrapper functions (v6.3)
See upstream commit :
commit
bc292ab00f6c7a661a8a605c714e8a148f629ef6
Author: Suren Baghdasaryan <surenb@google.com>
Date: Thu Jan 26 11:37:47 2023 -0800
mm: introduce vma->vm_flags wrapper functions
vm_flags are among VMA attributes which affect decisions like VMA merging
and splitting. Therefore all vm_flags modifications are performed after
taking exclusive mmap_lock to prevent vm_flags updates racing with such
operations. Introduce modifier functions for vm_flags to be used whenever
flags are updated. This way we can better check and control correct
locking behavior during these updates.
Change-Id: I2cf662420d9d7748e5e310d3ea4bac98ba7d7f94
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 3 Mar 2023 15:39:24 +0000 (10:39 -0500)]
Version 2.13.9
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie5399d8f24102ee78aa6950222aa64289bbdb6ed
Michael Jeanson [Wed, 18 Jan 2023 21:32:04 +0000 (16:32 -0500)]
fix: jbd2: use the correct print format (v5.4.229)
See upstream commit :
commit
ecb9d0d2e123874bcdd2efdecda0f4e0c3dc566d
Author: Bixuan Cui <cuibixuan@linux.alibaba.com>
Date: Tue Oct 11 19:33:44 2022 +0800
jbd2: use the correct print format
[ Upstream commit
d87a7b4c77a997d5388566dd511ca8e6b8e8a0a8 ]
The print format error was found when using ftrace event:
<...>-1406 [000] ....
23599442.895823: jbd2_end_commit: dev 252,8 transaction -
1866216965 sync 0 head -
1866217368
<...>-1406 [000] ....
23599442.896299: jbd2_start_commit: dev 252,8 transaction -
1866216964 sync 0
Use the correct print format for transaction, head and tid.
Change-Id: Ieee3d39ed1f2515e096e87d18b5ea8f921c54bd0
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 17 Jan 2023 17:16:04 +0000 (12:16 -0500)]
fix: jbd2 upper bound for v5.10.163
Use the correct upper bound of 5,11,0.
Change-Id: I435b44b940c7346ed8c3ef0d445365ed156702d0
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 17 Jan 2023 16:03:12 +0000 (11:03 -0500)]
fix: jbd2: use the correct print format (v5.10.163)
See upstream commit :
commit
d87a7b4c77a997d5388566dd511ca8e6b8e8a0a8
Author: Bixuan Cui <cuibixuan@linux.alibaba.com>
Date: Tue Oct 11 19:33:44 2022 +0800
jbd2: use the correct print format
The print format error was found when using ftrace event:
<...>-1406 [000] ....
23599442.895823: jbd2_end_commit: dev 252,8 transaction -
1866216965 sync 0 head -
1866217368
<...>-1406 [000] ....
23599442.896299: jbd2_start_commit: dev 252,8 transaction -
1866216964 sync 0
Use the correct print format for transaction, head and tid.
Change-Id: I7601f5cbb86495c2607be7b11e02724c90b3ebf9
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 16 Jan 2023 20:01:51 +0000 (15:01 -0500)]
fix: btrfs: move accessor helpers into accessors.h (v6.2)
See upstream commit :
commit
07e81dc94474eb62705c6f96d9ab1a5a797b8703
Author: Josef Bacik <josef@toxicpanda.com>
Date: Wed Oct 19 10:51:00 2022 -0400
btrfs: move accessor helpers into accessors.h
This is a large patch, but because they're all macros it's impossible to
split up. Simply copy all of the item accessors in ctree.h and paste
them in accessors.h, and then update any files to include the header so
everything compiles.
Change-Id: I1f0876dd8b7a8687f6802b60c3e3baabd017cc52
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 13 Jan 2023 21:08:06 +0000 (16:08 -0500)]
Version 2.13.8
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I3686e4e44475aa8cd6aa435f74e4994f5e36da2e
Michael Jeanson [Thu, 12 Jan 2023 18:52:22 +0000 (13:52 -0500)]
fix: jbd2: use the correct print format
See upstream commit :
commit
d87a7b4c77a997d5388566dd511ca8e6b8e8a0a8
Author: Bixuan Cui <cuibixuan@linux.alibaba.com>
Date: Tue Oct 11 19:33:44 2022 +0800
jbd2: use the correct print format
The print format error was found when using ftrace event:
<...>-1406 [000] ....
23599442.895823: jbd2_end_commit: dev 252,8 transaction -
1866216965 sync 0 head -
1866217368
<...>-1406 [000] ....
23599442.896299: jbd2_start_commit: dev 252,8 transaction -
1866216964 sync 0
Use the correct print format for transaction, head and tid.
Change-Id: Ic053f0e0c1e24ebc75bae51d07696aaa5e1c0094
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 1 Dec 2022 16:33:20 +0000 (11:33 -0500)]
Fix: in_x32_syscall was introduced in v4.7.0
Prior to v4.7.0, is_x32_task() was the API to query whether the current
system call is following the x32 ABI.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I783bd3bb46ec5e863ae209f79cee2f1bb415e661
Mathieu Desnoyers [Wed, 30 Nov 2022 20:41:02 +0000 (15:41 -0500)]
Explicitly skip tracing x32 system calls
x86 x32 system calls are not supported by LTTng. They are currently not
traced simply because their system call number is beyond the range of
NR_compat_syscalls.
However, this mostly happens by accident rather than by design.
Enforce this with an explicit check for in_x32_syscall(), which clearly
documents that those are not supported.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I1235c32c5cf03612bf9c36785cf7c4f8f49d292b
Michael Jeanson [Thu, 24 Nov 2022 19:25:33 +0000 (14:25 -0500)]
fix: kallsyms wrapper on ppc64el
The 'PPC64_ELF_ABI_v2' macro in 'asm/types.h' was removed in v5.19 and
replaced by a config option 'CONFIG_PPC64_ELF_ABI_V2'.
See upstream commit :
commit
5b89492c03e5c0a2c259b97d7d4c1bb9b02860aa
Author: Christophe Leroy <christophe.leroy@csgroup.eu>
Date: Mon May 9 07:36:08 2022 +0200
powerpc: Finalise cleanup around ABI use
Now that we have CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI_V2,
get rid of all indirect detection of ABI version.
Link: https://lore.kernel.org/r/709d9d69523c14c8a9fba4486395dca0f2d675b1.1652074503.git.christophe.leroy@csgroup.eu
Change-Id: Ibd00e35cab5516a6224bdfa5a6b540119b42dc55
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Fri, 11 Nov 2022 15:47:54 +0000 (10:47 -0500)]
fix: Adjust ranges for RHEL 8.6 kernels
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0b2c90f3678d0fb4503f61f336a4af185de2b39d
Michael Jeanson [Tue, 8 Nov 2022 16:26:46 +0000 (11:26 -0500)]
fix: kvm-x86 requires CONFIG_KALLSYMS_ALL
Fixes: #1363
Change-Id: I6da15f77123c393ccb9109b562c7c8dc5bbb96a5
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 17 Oct 2022 17:49:51 +0000 (13:49 -0400)]
fix: mm/slab_common: drop kmem_alloc & avoid dereferencing fields when not using (v6.1)
See uptream commit:
commit
2c1d697fb8ba6d2d44f914d4268ae1ccdf025f1b
Author: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Date: Wed Aug 17 19:18:24 2022 +0900
mm/slab_common: drop kmem_alloc & avoid dereferencing fields when not using
Drop kmem_alloc event class, and define kmalloc and kmem_cache_alloc
using TRACE_EVENT() macro.
And then this patch does:
- Do not pass pointer to struct kmem_cache to trace_kmalloc.
gfp flag is enough to know if it's accounted or not.
- Avoid dereferencing s->object_size and s->size when not using kmem_cache_alloc event.
- Avoid dereferencing s->name in when not using kmem_cache_free event.
- Adjust s->size to SLOB_UNITS(s->size) * SLOB_UNIT in SLOB
Change-Id: Icd7925731ed4a737699c3746cb7bb7760a4e8009
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 30 Sep 2022 21:11:06 +0000 (17:11 -0400)]
Version 2.13.7
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I28620e23756e3e91965839801ea8828b3f2b919c
Mathieu Desnoyers [Fri, 30 Sep 2022 20:19:16 +0000 (16:19 -0400)]
Fix: handle integer capture page faults as skip field
Now that we have the appropriate save/restore position mechanism for
error handling in place, we can handle page faults on integer
copy-from-user by skipping the offending captured field entirely rather
than relying on an arbitrary 0 value.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I4ec6243d96753ce7e9c6230563713aeacb126567
Mathieu Desnoyers [Fri, 30 Sep 2022 19:18:34 +0000 (15:18 -0400)]
Version 2.13.6
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Idecfca64078038637c4a790adac84d87893d2bdd
Mathieu Desnoyers [Fri, 30 Sep 2022 14:14:18 +0000 (10:14 -0400)]
Fix: bytecode validator: reject specialized load field/context ref instructions
Reject specialized load field/context ref instructions so a bytecode
crafted with nefarious intent cannot:
- Read user-space memory without proper get_user accessors,
- Read a memory area larger than the memory targeted by the instrumentation.
This prevents bytecode received from a tracing group user from oopsing
the kernel or disclosing the content of kernel memory to the tracing
group
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I2bda938a3a050f20be1d3d542aefe638b1b8bf73
Mathieu Desnoyers [Thu, 29 Sep 2022 19:29:21 +0000 (15:29 -0400)]
Fix: bytecode validator: reject specialized load instructions
Reject specialized load instructions so a bytecode crafted with
nefarious intent cannot:
- Read user-space memory without proper get_user accessors,
- Read a memory area larger than the memory targeted by the instrumentation.
This prevents bytecode received from a tracing group user from oopsing
the kernel or disclosing the content of kernel memory to the tracing
group.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I6bcdf37d4a8601164082b3c24358bf0e765a2c92
Mathieu Desnoyers [Thu, 29 Sep 2022 18:26:27 +0000 (14:26 -0400)]
Fix: honor "user" attribute for array/sequence of user integers
The macro _lttng_kernel_static_type_integer_from_type() should map to
_lttng_kernel_static_type_integer() to pass the "_user" attribute.
Otherwise, userspace fields such as pipe2's system call fildes field (a
ctf_user_array()) can trigger NULL pointer exceptions and read arbitrary
kernel memory if the pipe2 system call receives a bogus pointer as input
while filtering/capture is accessing this field.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I44276d751b822f214804184d1ce4d9b10b47d89d
He Zhe [Tue, 27 Sep 2022 07:59:42 +0000 (15:59 +0800)] 
wrapper: powerpc64: fix kernel crash caused by do_get_kallsyms
Kernel crashes on powerpc64 ABIv2 as follow when lttng_tracer initializes,
since do_get_kallsyms in lttng_wrapper fails to return a proper address of
kallsyms_lookup_name.
root@qemuppc64:~# lttng create trace_session --live -U net://127.0.0.1
Spawning a session daemon
lttng_kretprobes: loading out-of-tree module taints kernel.
BUG: Unable to handle kernel data access on read at 0xfffffffffffffff8
Faulting instruction address: 0xc0000000001f6fd0
Oops: Kernel access of bad area, sig: 11 [#1]
<snip>
NIP [
c0000000001f6fd0] module_kallsyms_lookup_name+0xf0/0x180
LR [
c0000000001f6f28] module_kallsyms_lookup_name+0x48/0x180
Call Trace:
module_kallsyms_lookup_name+0x34/0x180 (unreliable)
kallsyms_lookup_name+0x258/0x2b0
wrapper_kallsyms_lookup_name+0x4c/0xd0 [lttng_wrapper]
wrapper_get_pfnblock_flags_mask_init+0x28/0x60 [lttng_wrapper]
lttng_events_init+0x40/0x344 [lttng_tracer]
do_one_initcall+0x78/0x340
do_init_module+0x6c/0x2f0
__do_sys_finit_module+0xd0/0x120
system_call_exception+0x194/0x2f0
system_call_vectored_common+0xe8/0x278
<snip>
do_get_kallsyms makes use of kprobe_register and in turn kprobe_lookup_name
to get the address of the kernel function kallsyms_lookup_name. In case of
PPC64_ELF_ABI_v2, when kprobes are placed at function entry,
kprobe_lookup_name adjusts the global entry point of the function returned
by kallsyms_lookup_name to the local entry point(at some fixed offset of
global one). This adjustment is all for kprobes to be able to work properly.
Global and local entry point are defined in powerpc64 ABIv2.
When the local entry point is given, some instructions at the beginning of
the function are skipped and thus causes the above kernel crash. We just
want to make a simple function call which needs global entry point.
This patch adds 4 bytes which is the length of one instruction to
kallsyms_lookup_name so that it will not trigger the global to local
adjustment, and then substracts 4 bytes from the returned address. See the
following kernel change for more details.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=
290e3070762ac80e5fc4087d8c4de7e3f1d90aca
Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I34e68e886b97e3976d0b5e25be295a8bb866c1a4
Mathieu Desnoyers [Wed, 28 Sep 2022 14:44:05 +0000 (10:44 -0400)]
Fix: event notification: Remove duplicate event enabled check
The event enabled checks are already done by the event notification
callers, so there is no point in checking it again.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I8033c053d6a601cf646a008d5325d556dba5a8f9
Mathieu Desnoyers [Wed, 28 Sep 2022 14:34:42 +0000 (10:34 -0400)]
Fix: event notification capture: validate buffer length
Validate that the buffer length is large enough to hold empty capture
fields.
If the buffer is initially not large enough to hold empty capture fields
for each field to capture, discard the notification.
If after capturing a field there is not enough room anymore in the
buffer to write empty capture fields, skip the offending large field by
writing an empty capture field in its place.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ifa2cdaf084e2ebee2efa052331107cb4d9095243
Mathieu Desnoyers [Tue, 27 Sep 2022 20:31:29 +0000 (16:31 -0400)]
Fix: handle capture page faults as skip field
Now that we have the appropriate save/restore position mechanism for
error handling in place, we can handle page faults on copy-from-user by
skipping the offending captured field entirely rather than relying on an
empty string.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ibe1e818f57f8218d2b83281a572895884fc28b86
Mathieu Desnoyers [Tue, 27 Sep 2022 19:07:24 +0000 (15:07 -0400)]
Fix: event notification capture error handling
When the captured fields end up taking more than 512 bytes of space for
the msgpack message, the notification append capture fails.
Currently, this is handled by printing a WARN_ON_ONCE() on the console,
and a printk "Error appending capture to notification" warning.
Considering that this kind of error is very much legitimate, spamming
the console with warnings is not the way we want to handle this.
Rather than print a warning on the console, reset the msgpack writer
position to skip the problematic captured field entirely when it is
erroneous.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I4c98dc85266dd7af5e11bbd3d73ab5118c9e03af
Mathieu Desnoyers [Mon, 5 Sep 2022 22:19:16 +0000 (18:19 -0400)]
Fix: capture_sequence_element_{un,}signed: handle user-space input
The "user" attribute (copy from userspace) is not applied to
sequence/array of integer field capture within event notifications. This
could eventually lead to unsafe copy of integers from user-space.
Currently, the only array/sequence of integers which are read from
user-space are the arguments to sys_select (e.g. `readfds` field). Those
are expressed as "custom" fields, which are skipped by the filter and
capture bytecode.
This is therefore not an issue with the current instrumentation, but we
should properly handle this nevertheless.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Icf0c141d333f63402d8a76051bcd53fcdd5ed8c2
Mathieu Desnoyers [Tue, 6 Sep 2022 15:59:17 +0000 (11:59 -0400)]
Fix: notification capture: handle userspace strings
The "user" attribute (copy from userspace) is not applied to string
field capture within event notifications. This leads to copy of strings
from user-space (e.g. `filename` field from sys_open) to end up using
strlen/memcpy on user-space data. This can cause kernel OOPS due to
unhandled page faults, and it also allows reading kernel memory through
the event notification capture mechanism. As a result, the users within
the `tracing` group can read arbitrary kernel memory.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I3241b144fea849004a3f0a19276506c9f1b0d5e5
Mathieu Desnoyers [Tue, 6 Sep 2022 15:57:58 +0000 (11:57 -0400)]
Implement lttng_msgpack_write_user_str
Implement lttng_msgpack_write_user_str to allow safely capturing
user-space strings.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0354382cdd599b041fd20e59bb673fda7d72b2be
Mathieu Desnoyers [Tue, 6 Sep 2022 19:10:17 +0000 (15:10 -0400)]
Fix: bytecode interpreter: LOAD_FIELD: handle user fields
The instructions for recursive traversal through composed types
are used by the capture bytecode, and by filter expressions which
access fields nested within composed types.
Instructions BYTECODE_OP_LOAD_FIELD_STRING and
BYTECODE_OP_LOAD_FIELD_SEQUENCE were leaving the "user" attribute
uninitialized. Initialize those to 0.
The handling of userspace strings and integers is missing in LOAD_FIELD
instructions. Therefore, ensure that the specialization leaves the
generic LOAD_FIELD instruction in place for userspace input.
Add a "user" attribute to:
- struct bytecode_get_index_data elem field (produced by the
specialization),
- struct vstack_load used by the specialization,
- struct load_ptr used by the interpreter.
- struct lttng_interpreter_output used by the event notification
capture.
Use this "user" attribute in dynamic_load_field() for integer, string
and string_sequence object types to ensure that the proper
userspace-aware accesses are performed when loading those fields.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ib8d4db5b7da5064e5897ab3802ab47e063607036
Mathieu Desnoyers [Mon, 5 Sep 2022 20:45:39 +0000 (16:45 -0400)]
Fix: move "user" attribute from field to type
The "user" field attribute (copy from userspace) is not taken into
account in the bytecode specialization and interpreter recursive
traversal through composed types (LOAD_FIELD bytecode instructions).
Those are currently used by the event notification capture bytecode, and
by filter expressions which access fields nested within composed types.
Move the "user" attribute from the event fields to the integer and
string types. This will allow ensuring that the bytecode specialization,
interpreter and event notification output capture have access to this
user attribute even in nested types (e.g. arrays, sequences) in a
subsequent change.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I044a0845b256b5e2cf65aa0888af2b906678d19d
Mathieu Desnoyers [Mon, 5 Sep 2022 21:55:37 +0000 (17:55 -0400)]
Introduce lttng_copy_from_user_check_nofault
This code will be re-used by the event notification capture code, so
move it out of the ring buffer.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I482adb5f619944285703425e278a70c601ce99b3
Michael Jeanson [Mon, 22 Aug 2022 18:16:27 +0000 (14:16 -0400)]
fix: adjust range v5.10.137 in block probe
See upstream commit, backported in v5.10.137 :
commit
1cb3032406423b25aa984854b4d78e0100d292dd
Author: Christoph Hellwig <hch@lst.de>
Date: Thu Dec 3 17:21:39 2020 +0100
block: remove the request_queue to argument request based tracepoints
[ Upstream commit
a54895fa057c67700270777f7661d8d3c7fda88a ]
The request_queue can trivially be derived from the request.
Change-Id: I01f96a437641421faf993b4b031171c372bd0374
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 19 Aug 2022 18:47:13 +0000 (14:47 -0400)]
Version 2.13.5
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: If7bcc8f8709c264d140a5e7c8c815efbec8d0508
Mathieu Desnoyers [Fri, 19 Aug 2022 14:37:58 +0000 (10:37 -0400)]
Fix: incorrect stub prototypes when CONFIG_HAVE_SYSCALL_TRACEPOINTS=n
The stub prototypes do not match the expected argument types, and extra
erroneous semicolons are present. This has been fixed by a refactoring
in the master branch:
commit
f2db8be348380b48e3795d14e49cc585b3c357fd
Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon Nov 1 15:14:44 2021 -0400
Cleanup: syscall filter enable/disable event
Fixes: #1357
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I43130c8ebb7fbc6961a3b73a7b04845bef59d318
Michael Jeanson [Mon, 15 Aug 2022 21:22:47 +0000 (17:22 -0400)]
fix: mm/tracing: add 'accounted' entry into output of allocation tracepoints (v6.0)
See upstream commit :
commit
b347aa7b57477f71c740e2bbc6d1078a7109ba23
Author: Vasily Averin <vasily.averin@linux.dev>
Date: Fri Jun 3 06:21:49 2022 +0300
mm/tracing: add 'accounted' entry into output of allocation tracepoints
Slab caches marked with SLAB_ACCOUNT force accounting for every
allocation from this cache even if __GFP_ACCOUNT flag is not passed.
Unfortunately, at the moment this flag is not visible in ftrace output,
and this makes it difficult to analyze the accounted allocations.
This patch adds boolean "accounted" entry into trace output,
and set it to 'true' for calls used __GFP_ACCOUNT flag and
for allocations from caches marked with SLAB_ACCOUNT.
Set it to 'false' if accounting is disabled in configs.
Change-Id: I023a355b94e79931499e1a1f648e2649d6dd3c89
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 15 Aug 2022 18:39:42 +0000 (14:39 -0400)]
fix: block: remove bdevname (v6.0)
See upstream commit :
commit
900d156bac2bc474cf7c7bee4efbc6c83ec5ae58
Author: Christoph Hellwig <hch@lst.de>
Date: Wed Jul 13 07:53:17 2022 +0200
block: remove bdevname
Replace the remaining calls of bdevname with snprintf using the %pg
format specifier.
Change-Id: I09f2afe91e549be2746334a4a09fc00be09b0778
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 15 Aug 2022 21:21:20 +0000 (17:21 -0400)]
fix: fs/jbd2: Fix the documentation of the jbd2_write_superblock() callers (v6.0)
See upstream commit :
commit
6669797b0dd41ced457760b6e1014fdda8ce19ce
Author: Bart Van Assche <bvanassche@acm.org>
Date: Thu Jul 14 11:07:22 2022 -0700
Commit
2a222ca992c3 ("fs: have submit_bh users pass in op and flags
separately") renamed the jbd2_write_superblock() 'write_op' argument into
'write_flags'. Propagate this change to the jbd2_write_superblock()
callers. Additionally, change the type of 'write_flags' into blk_opf_t.
Change-Id: I65b8af95b3d07438763dd94f409c197e3b400733
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Wed, 10 Aug 2022 15:07:14 +0000 (11:07 -0400)]
fix: tie compaction probe build to CONFIG_COMPACTION
The definition of 'struct compact_control' in 'mm/internal.h' depends on
CONFIG_COMPACTION being defined. Only build the compaction probe when
this configuration option is enabled.
Thanks to Bruce Ashfield <bruce.ashfield@gmail.com> for reporting this
issue.
Change-Id: I81e77aa9c1bf10452c152d432fe5224df0db42c9
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 29 Jul 2022 19:37:43 +0000 (15:37 -0400)]
fix: net: skb: introduce kfree_skb_reason() (v5.15.58..v5.16)
See upstream commit :
commit
c504e5c2f9648a1e5c2be01e8c3f59d394192bd3
Author: Menglong Dong <imagedong@tencent.com>
Date: Sun Jan 9 14:36:26 2022 +0800
net: skb: introduce kfree_skb_reason()
Introduce the interface kfree_skb_reason(), which is able to pass
the reason why the skb is dropped to 'kfree_skb' tracepoint.
Add the 'reason' field to 'trace_kfree_skb', therefor user can get
more detail information about abnormal skb with 'drop_monitor' or
eBPF.
All drop reasons are defined in the enum 'skb_drop_reason', and
they will be print as string in 'kfree_skb' tracepoint in format
of 'reason: XXX'.
( Maybe the reasons should be defined in a uapi header file, so that
user space can use them? )
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ib3c039207739dad10f097cf76474e0822e351273
Michael Jeanson [Wed, 15 Jun 2022 16:07:16 +0000 (12:07 -0400)]
fix: workqueue: Fix type of cpu in trace event (v5.19)
See upstream commit :
commit
873a400938b31a1e443c4d94b560b78300787540
Author: Wonhyuk Yang <vvghjk1234@gmail.com>
Date: Wed May 4 11:32:03 2022 +0900
workqueue: Fix type of cpu in trace event
The trace event "workqueue_queue_work" use unsigned int type for
req_cpu, cpu. This casue confusing cpu number like below log.
$ cat /sys/kernel/debug/tracing/trace
cat-317 [001] ...: workqueue_queue_work: ... req_cpu=8192 cpu=
4294967295
So, change unsigned type to signed type in the trace event. After
applying this patch, cpu number will be printed as -1 instead of
4294967295 as folllows.
$ cat /sys/kernel/debug/tracing/trace
cat-1338 [002] ...: workqueue_queue_work: ... req_cpu=8192 cpu=-1
Change-Id: I478083c350b6ec314d87e9159dc5b342b96daed7
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Wed, 8 Jun 2022 17:07:59 +0000 (13:07 -0400)]
fix: fs: Remove flags parameter from aops->write_begin (v5.19)
See upstream commit :
commit
9d6b0cd7579844761ed68926eb3073bab1dca87b
Author: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Tue Feb 22 14:31:43 2022 -0500
fs: Remove flags parameter from aops->write_begin
There are no more aop flags left, so remove the parameter.
Change-Id: I82725b93e13d749f52a631b2ac60df81a5e839f8
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Wed, 8 Jun 2022 16:56:36 +0000 (12:56 -0400)]
fix: mm/page_alloc: fix tracepoint mm_page_alloc_zone_locked() (v5.19)
See upstream commit :
commit
10e0f7530205799e7e971aba699a7cb3a47456de
Author: Wonhyuk Yang <vvghjk1234@gmail.com>
Date: Thu May 19 14:08:54 2022 -0700
mm/page_alloc: fix tracepoint mm_page_alloc_zone_locked()
Currently, trace point mm_page_alloc_zone_locked() doesn't show correct
information.
First, when alloc_flag has ALLOC_HARDER/ALLOC_CMA, page can be allocated
from MIGRATE_HIGHATOMIC/MIGRATE_CMA. Nevertheless, tracepoint use
requested migration type not MIGRATE_HIGHATOMIC and MIGRATE_CMA.
Second, after commit
44042b4498728 ("mm/page_alloc: allow high-order pages
to be stored on the per-cpu lists") percpu-list can store high order
pages. But trace point determine whether it is a refiil of percpu-list by
comparing requested order and 0.
To handle these problems, make mm_page_alloc_zone_locked() only be called
by __rmqueue_smallest with correct migration type. With a new argument
called percpu_refill, it can show roughly whether it is a refill of
percpu-list.
Change-Id: I2e4a57393757f12b9c5a4566c4d1102ee2474a09
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 3 Jun 2022 19:00:26 +0000 (15:00 -0400)]
Version 2.13.4
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I37d9d03bfc0bae7c271ce3956e71919c4e2fb6e7
Mathieu Desnoyers [Mon, 4 Apr 2022 19:42:00 +0000 (15:42 -0400)]
Fix: event notifier: racy use of last subbuffer record
The lttng-modules event notifiers use the ring buffer internally. When
reading the payload of the last event in a sub-buffer with a multi-part
read (e.g. two read system calls), we should not "put" the sub-buffer
holding this data, else continuing reading the data in the following
read system call can observe corrupted data if it has been concurrently
overwritten by the producer.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Idb051e50ee8a25958cfd63a9b143f4943ca2e01a
Mathieu Desnoyers [Wed, 30 Mar 2022 18:24:54 +0000 (14:24 -0400)]
Fix: bytecode interpreter context_get_index() leaves byte order uninitialized
Observed Issue
==============
When using the event notification capture feature to capture a context
field, e.g. '$ctx.cpu_id', the captured value is often observed in
reverse byte order.
Cause
=====
Within the bytecode interpreter, context_get_index() leaves the "rev_bo"
field uninitialized in the top of stack.
This only affects the event notification capture bytecode because the
BYTECODE_OP_GET_SYMBOL bytecode instruction (as of lttng-tools 2.13)
is only generated for capture bytecode in lttng-tools. Therefore, only
capture bytecode targeting contexts are affected by this issue. The
reason why lttng-tools uses the "legacy" bytecode instruction to get
context (BYTECODE_OP_GET_CONTEXT_REF) for the filter bytecode is to
preserve backward compatibility of filtering when interacting with
applications linked against LTTng-UST 2.12.
Solution
========
Initialize the rev_bo field based on the context field type
reserve_byte_order field.
Known drawbacks
===============
None.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I1483642b0b8f6bc28d5b68be170a04fb419fd9b3
Michael Jeanson [Tue, 31 May 2022 19:24:48 +0000 (15:24 -0400)]
fix: 'random' tracepoints removed in stable kernels
The upstream commit
14c174633f349cb41ea90c2c0aaddac157012f74 removing
the 'random' tracepoints is being backported to multiple stable kernel
branches, I don't see how that qualifies as a fix but here we are.
Use the presence of 'include/trace/events/random.h' in the kernel source
tree instead of the rather tortuous version check to determine if we
need to build 'lttng-probe-random.ko'.
Change-Id: I8f5f2f4c9e09c61127c49c7949b22dd3fab0460d
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
He Zhe [Thu, 2 Jun 2022 06:36:08 +0000 (06:36 +0000)]
fix: random: remove unused tracepoints (v5.10, v5.15)
The following kernel commit has been back ported to v5.10.119 and v5.15.44.
commit
14c174633f349cb41ea90c2c0aaddac157012f74
Author: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Thu Feb 10 16:40:44 2022 +0100
random: remove unused tracepoints
These explicit tracepoints aren't really used and show sign of aging.
It's work to keep these up to date, and before I attempted to keep them
up to date, they weren't up to date, which indicates that they're not
really used. These days there are better ways of introspecting anyway.
Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0b7eb8aa78b5bd2039e20ae3e1da4c5eb9018789
Michael Jeanson [Tue, 17 May 2022 15:46:29 +0000 (11:46 -0400)]
fix: sched/tracing: Append prev_state to tp args instead (v5.18)
See upstream commit :
commit
9c2136be0878c88c53dea26943ce40bb03ad8d8d
Author: Delyan Kratunov <delyank@fb.com>
Date: Wed May 11 18:28:36 2022 +0000
sched/tracing: Append prev_state to tp args instead
Commit
fa2c3254d7cf (sched/tracing: Don't re-read p->state when emitting
sched_switch event, 2022-01-20) added a new prev_state argument to the
sched_switch tracepoint, before the prev task_struct pointer.
This reordering of arguments broke BPF programs that use the raw
tracepoint (e.g. tp_btf programs). The type of the second argument has
changed and existing programs that assume a task_struct* argument
(e.g. for bpf_task_storage access) will now fail to verify.
If we instead append the new argument to the end, all existing programs
would continue to work and can conditionally extract the prev_state
argument on supported kernel versions.
Change-Id: Ife2ec88a8bea2743562590cbd357068d7773863f
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 19:14:01 +0000 (15:14 -0400)]
fix: mm: compaction: cleanup the compaction trace events (v5.18)
See upstream commit :
commit
abd4349ff9b8d242376b67711254221f64f447c7
Author: Baolin Wang <baolin.wang@linux.alibaba.com>
Date: Tue Mar 22 14:45:56 2022 -0700
mm: compaction: cleanup the compaction trace events
As Steven suggested [1], we should access the pointers from the trace
event to avoid dereferencing them to the tracepoint function when the
tracepoint is disabled.
[1] https://lkml.org/lkml/2021/11/3/409
Change-Id: I6c08250df8596e8dbc76780ae5d95c899c12e6fe
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 19:08:48 +0000 (15:08 -0400)]
fix: scsi: core: Remove <scsi/scsi_request.h> (v5.18)
See upstream commit :
commit
26440303310591e29121964ede0048583cb3126d
Author: Christoph Hellwig <hch@lst.de>
Date: Thu Feb 24 18:55:52 2022 +0100
scsi: core: Remove <scsi/scsi_request.h>
This header is empty now except for an include of <linux/blk-mq.h>, so
remove it.
Change-Id: Ic8ee3352f1e8bddfcd44c31be9b788db82f183aa
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 19:02:10 +0000 (15:02 -0400)]
fix: kprobes: Use rethook for kretprobe if possible (v5.18)
See upstream commit :
commit
73f9b911faa74ac5107879de05c9489c419f41bb
Author: Masami Hiramatsu <mhiramat@kernel.org>
Date: Sat Mar 26 11:27:05 2022 +0900
kprobes: Use rethook for kretprobe if possible
Use rethook for kretprobe function return hooking if the arch sets
CONFIG_HAVE_RETHOOK=y. In this case, CONFIG_KRETPROBE_ON_RETHOOK is
set to 'y' automatically, and the kretprobe internal data fields
switches to use rethook. If not, it continues to use kretprobe
specific function return hooks.
Change-Id: I2b7670dc04e4769c1e3c372582ad2f555f6d7a66
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 18:33:42 +0000 (14:33 -0400)]
fix: random: remove unused tracepoints (v5.18)
See upstream commit :
commit
14c174633f349cb41ea90c2c0aaddac157012f74
Author: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Thu Feb 10 16:40:44 2022 +0100
random: remove unused tracepoints
These explicit tracepoints aren't really used and show sign of aging.
It's work to keep these up to date, and before I attempted to keep them
up to date, they weren't up to date, which indicates that they're not
really used. These days there are better ways of introspecting anyway.
Change-Id: I3b8c3e2732e7efdd76ce63204ac53a48784d0df6
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 18:12:13 +0000 (14:12 -0400)]
fix: scsi: block: Remove REQ_OP_WRITE_SAME support (v5.18)
See upstream commit :
commit
73bd66d9c834220579c881a3eb020fd8917075d8
Author: Christoph Hellwig <hch@lst.de>
Date: Wed Feb 9 09:28:28 2022 +0100
scsi: block: Remove REQ_OP_WRITE_SAME support
No more users of REQ_OP_WRITE_SAME or drivers implementing it are left,
so remove the infrastructure.
Change-Id: Ifbff71f79f8b590436fc7cb79f82d90c6e033d84
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 17:54:59 +0000 (13:54 -0400)]
fix: block: remove genhd.h (v5.18)
See upstream commit :
commit
322cbb50de711814c42fb088f6d31901502c711a
Author: Christoph Hellwig <hch@lst.de>
Date: Mon Jan 24 10:39:13 2022 +0100
block: remove genhd.h
There is no good reason to keep genhd.h separate from the main blkdev.h
header that includes it. So fold the contents of genhd.h into blkdev.h
and remove genhd.h entirely.
Change-Id: I7cf2aaa3a4c133320b95f2edde49f790f9515dbd
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 17:52:57 +0000 (13:52 -0400)]
fix: sched/tracing: Don't re-read p->state when emitting sched_switch event (v5.18)
See upstream commit :
commit
fa2c3254d7cfff5f7a916ab928a562d1165f17bb
Author: Valentin Schneider <valentin.schneider@arm.com>
Date: Thu Jan 20 16:25:19 2022 +0000
sched/tracing: Don't re-read p->state when emitting sched_switch event
As of commit
c6e7bd7afaeb ("sched/core: Optimize ttwu() spinning on p->on_cpu")
the following sequence becomes possible:
p->__state = TASK_INTERRUPTIBLE;
__schedule()
deactivate_task(p);
ttwu()
READ !p->on_rq
p->__state=TASK_WAKING
trace_sched_switch()
__trace_sched_switch_state()
task_state_index()
return 0;
TASK_WAKING isn't in TASK_REPORT, so the task appears as TASK_RUNNING in
the trace event.
Prevent this by pushing the value read from __schedule() down the trace
event.
Change-Id: I46743cd006be4b4d573cae2d77df7d6d16744d04
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 4 Apr 2022 20:28:26 +0000 (16:28 -0400)]
fix: KVM: x86: Unexport kvm_x86_ops (v5.18)
See upstream commit :
commit
dfc4e6ca041135217c07ebcd102b6694cea22856
Author: Sean Christopherson <seanjc@google.com>
Date: Fri Jan 28 00:51:56 2022 +0000
KVM: x86: Unexport kvm_x86_ops
Drop the export of kvm_x86_ops now it is no longer referenced by SVM or
VMX. Disallowing access to kvm_x86_ops is very desirable as it prevents
vendor code from incorrectly modifying hooks after they have been set by
kvm_arch_hardware_setup(), and more importantly after each function's
associated static_call key has been updated.
No functional change intended.
Change-Id: Icee959a984570f95ab9b71354225b5aeecea7da0
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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