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authorliguang <lig.fnst@cn.fujitsu.com>2013-05-01 00:27:25 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-01 02:04:02 +0200
commit1def1dc91715acdb6dddfaed1a44149d42d8063c (patch)
tree34bbf0888cf4fbf32fe37e2851f44c0304c5a241 /kernel/smp.c
parentwriteback: set worker desc to identify writeback workers in task dumps (diff)
downloadlinux-1def1dc91715acdb6dddfaed1a44149d42d8063c.tar.xz
linux-1def1dc91715acdb6dddfaed1a44149d42d8063c.zip
kernel/smp.c: use '|=' for csd_lock
csd_lock() uses assignment to data->flags rather than |=. That is not buggy at present because only one bit (CSD_FLAG_LOCK) is defined in call_single_data.flags. But it will become buggy if we later add another flag, so fix it now. Signed-off-by: liguang <lig.fnst@cn.fujitsu.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/smp.c')
-rw-r--r--kernel/smp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index 8e451f3ff51b..b320622543e9 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -109,7 +109,7 @@ static void csd_lock_wait(struct call_single_data *data)
static void csd_lock(struct call_single_data *data)
{
csd_lock_wait(data);
- data->flags = CSD_FLAG_LOCK;
+ data->flags |= CSD_FLAG_LOCK;
/*
* prevent CPU from reordering the above assignment