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| author | liguang <lig.fnst@cn.fujitsu.com> | 2013-04-30 15:27:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-30 17:04:02 -0700 |
| commit | 1def1dc91715acdb6dddfaed1a44149d42d8063c (patch) | |
| tree | 34bbf0888cf4fbf32fe37e2851f44c0304c5a241 /kernel/smp.c | |
| parent | ef3b101925f2170c2b8cd2e126b37492ae02f77c (diff) | |
| download | lwn-1def1dc91715acdb6dddfaed1a44149d42d8063c.tar.gz lwn-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.c | 2 |
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 |