From: Michael Jeanson <mjeanson@efficios.com>
Date: Mon, 8 Feb 2021 20:32:47 +0000 (-0500)
Subject: fix: RT_PATCH_VERSION is close to overflow
X-Git-Tag: v2.13.0-rc1~48
X-Git-Url: http://git.lttng.org/?p=lttng-modules.git;a=commitdiff_plain;h=b737968d5f0badac76586270e7df4ce6447adc5a

fix: RT_PATCH_VERSION is close to overflow

We allocated only 8bits for RT_PATCH_VERSION in LTTNG_RT_VERSION_CODE,
the current RT patch version for the 4.4 branch is currently 214 which
is getting close to 256. Bump it to 16bits to avoid breakage in the
future.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I0666bbe996854696ac98e025eb02e5fced0540b1
---

diff --git a/include/lttng/kernel-version.h b/include/lttng/kernel-version.h
index 747a674f..88f621e9 100644
--- a/include/lttng/kernel-version.h
+++ b/include/lttng/kernel-version.h
@@ -166,11 +166,11 @@
 /* RT patch */
 
 #define LTTNG_RT_KERNEL_VERSION(a, b, c, d) \
-	(((LTTNG_KERNEL_VERSION(a, b, c)) << 8) + (d))
+	(((LTTNG_KERNEL_VERSION(a, b, c)) << 16) + (d))
 
 #ifdef RT_PATCH_VERSION
 #define LTTNG_RT_VERSION_CODE \
-	((LTTNG_LINUX_VERSION_CODE << 8) + RT_PATCH_VERSION)
+	((LTTNG_LINUX_VERSION_CODE << 16) + RT_PATCH_VERSION)
 #else
 #define LTTNG_RT_VERSION_CODE 	0
 #endif