diff options
| author | Davidlohr Bueso <[email protected]> | 2016-04-06 10:05:15 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2016-04-13 10:54:23 +0200 |
| commit | bf92b1feb658f6a262daf3a87d790997a1dca0ff (patch) | |
| tree | 46bae68fb5d0303a87d4982879fae9cbc637b5c0 | |
| parent | 69385f8879344f4a1f078f761bd3523fcf697131 (diff) | |
x86/mce: Remove explicit smp_rmb() when starting CPUs sync
mce_start() has an explicit smp_wmb() to serialize writes to global_nwo
and mce_callin. However, atomic_inc_return() implies barriers on both
sides of the call, as such simply rely on this full SMP barrier.
Signed-off-by: Davidlohr Bueso <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: linux-edac <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index f0c921b03e42..6b7039c166b8 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -830,9 +830,9 @@ static int mce_start(int *no_way_out) atomic_add(*no_way_out, &global_nwo); /* - * global_nwo should be updated before mce_callin + * Rely on the implied barrier below, such that global_nwo + * is updated before mce_callin. */ - smp_wmb(); order = atomic_inc_return(&mce_callin); /* |