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1 | #ifndef _LTTNG_WRAPPER_PAGE_ALLOC_H |
2 | #define _LTTNG_WRAPPER_PAGE_ALLOC_H | |
3 | ||
4 | /* | |
5 | * wrapper/page_alloc.h | |
6 | * | |
7 | * wrapper around get_pfnblock_flags_mask. Using KALLSYMS to get its address | |
8 | * when available, else we need to have a kernel that exports this function to | |
9 | * GPL modules. | |
10 | * | |
11 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
12 | * | |
13 | * This library is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU Lesser General Public | |
15 | * License as published by the Free Software Foundation; only | |
16 | * version 2.1 of the License. | |
17 | * | |
18 | * This library is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * Lesser General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU Lesser General Public | |
24 | * License along with this library; if not, write to the Free Software | |
25 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
26 | */ | |
27 | ||
28 | #include "../lttng-kernel-version.h" | |
29 | ||
30 | /* | |
31 | * We need to redefine get_pfnblock_flags_mask to our wrapper, because | |
32 | * the get_pageblock_migratetype() macro uses it. | |
33 | */ | |
34 | #if defined(CONFIG_KALLSYMS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,2)) | |
35 | ||
36 | #define get_pfnblock_flags_mask wrapper_get_pfnblock_flags_mask | |
37 | ||
38 | #include <linux/mm_types.h> | |
39 | ||
40 | int wrapper_get_pfnblock_flags_mask_init(void); | |
41 | ||
7d5f6cef | 42 | #else |
66861b2e MD |
43 | |
44 | #include <linux/mm_types.h> | |
45 | ||
46 | static inline | |
47 | int wrapper_get_pfnblock_flags_mask_init(void) | |
48 | { | |
49 | return 0; | |
50 | } | |
51 | ||
7d5f6cef MD |
52 | #endif |
53 | ||
54 | /* | |
55 | * For a specific range of Ubuntu 3.13 kernels, we need to redefine | |
56 | * get_pageblock_flags_mask to our wrapper, because the | |
57 | * get_pageblock_migratetype() macro uses it. This function has been | |
58 | * introduced into mainline within commit | |
59 | * e58469bafd0524e848c3733bc3918d854595e20f, but never actually showed | |
60 | * up in a stable kernel version, since it has been changed by commit | |
61 | * dc4b0caff24d9b2918e9f27bc65499ee63187eba. Since Ubuntu chose to only | |
62 | * backport the former commit but not the latter, we need to do a | |
63 | * special case to cover this. | |
64 | */ | |
65 | #if (defined(CONFIG_KALLSYMS) \ | |
66 | && LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0)) | |
67 | ||
68 | #define get_pageblock_flags_mask wrapper_get_pageblock_flags_mask | |
69 | ||
70 | #include <linux/mm_types.h> | |
71 | ||
72 | int wrapper_get_pageblock_flags_mask_init(void); | |
73 | ||
74 | #else | |
75 | ||
76 | #include <linux/mm_types.h> | |
77 | ||
78 | static inline | |
79 | int wrapper_get_pageblock_flags_mask_init(void) | |
80 | { | |
81 | return 0; | |
82 | } | |
83 | ||
84 | #endif | |
66861b2e MD |
85 | |
86 | #endif /* _LTTNG_WRAPPER_PAGE_ALLOC_H */ |