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authorGautham R Shenoy <ego@in.ibm.com>2006-11-05 23:52:04 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-11-06 01:46:22 -0800
commit4b96b1a10cb00c867103b21f0f2a6c91b705db11 (patch)
tree25b95e00b413025682b933da182caca2a048a475
parentd1ed6a3ea10aa7b199c434f6ffd1b6761896567a (diff)
downloadlinux-2.6.34-ux500-4b96b1a10cb00c867103b21f0f2a6c91b705db11.tar.gz
[PATCH] Fix the spurious unlock_cpu_hotplug false warnings
Cpu-hotplug locking has a minor race case caused because of setting the variable "recursive" to NULL *after* releasing the cpu_bitmask_lock in the function unlock_cpu_hotplug,instead of doing so before releasing the cpu_bitmask_lock. This was the cause of most of the recent false spurious lock_cpu_unlock warnings. This should fix the problem reported by Martin Lorenz reported in http://lkml.org/lkml/2006/10/29/127. Thanks to Srinivasa DS for pointing it out. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--kernel/cpu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 663c920b223..272254f20d9 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -58,8 +58,8 @@ void unlock_cpu_hotplug(void)
recursive_depth--;
return;
}
- mutex_unlock(&cpu_bitmask_lock);
recursive = NULL;
+ mutex_unlock(&cpu_bitmask_lock);
}
EXPORT_SYMBOL_GPL(unlock_cpu_hotplug);