The patch titled
Fix the spurious unlock_cpu_hotplug false warnings
has been added to the -mm tree. Its filename is
fix-the-spurious-unlock_cpu_hotplug-false-warnings.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Fix the spurious unlock_cpu_hotplug false warnings
From: Gautham R Shenoy <ego@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/cpu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/cpu.c~fix-the-spurious-unlock_cpu_hotplug-false-warnings kernel/cpu.c
--- a/kernel/cpu.c~fix-the-spurious-unlock_cpu_hotplug-false-warnings
+++ a/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);
_
Patches currently in -mm which might be from ego@xxxxxxxxxx are
fix-the-spurious-unlock_cpu_hotplug-false-warnings.patch
-
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