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[PATCH] Fix the spurious unlock_cpu_hotplug false warnings

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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>
This commit is contained in:
Gautham R Shenoy 2006-11-05 23:52:04 -08:00 committed by Linus Torvalds
parent d1ed6a3ea1
commit 4b96b1a10c
1 changed files with 1 additions and 1 deletions
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2
kernel/cpu.c
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@ -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);