Commit-ID: 919fc6e34831d1c2b58bfb5ae261dc3facc9b269
Gitweb: http://git.kernel.org/tip/919fc6e34831d1c2b58bfb5ae261dc3facc9b269
Author: Paul E. McKenney <[email protected]>
AuthorDate: Wed, 11 Dec 2013 13:59:11 -0800
Committer: Ingo Molnar <[email protected]>
CommitDate: Mon, 16 Dec 2013 11:36:18 +0100
powerpc: Full barrier for smp_mb__after_unlock_lock()
The powerpc lock acquisition sequence is as follows:
lwarx; cmpwi; bne; stwcx.; lwsync;
Lock release is as follows:
lwsync; stw;
If CPU 0 does a store (say, x=1) then a lock release, and CPU 1
does a lock acquisition then a load (say, r1=y), then there is
no guarantee of a full memory barrier between the store to 'x'
and the load from 'y'. To see this, suppose that CPUs 0 and 1
are hardware threads in the same core that share a store buffer,
and that CPU 2 is in some other core, and that CPU 2 does the
following:
y = 1; sync; r2 = x;
If 'x' and 'y' are both initially zero, then the lock
acquisition and release sequences above can result in r1 and r2
both being equal to zero, which could not happen if unlock+lock
was a full barrier.
This commit therefore makes powerpc's
smp_mb__after_unlock_lock() be a full barrier.
Signed-off-by: Paul E. McKenney <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Reviewed-by: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: [email protected]
Cc: <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andrew Morton <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
arch/powerpc/include/asm/spinlock.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/powerpc/include/asm/spinlock.h
b/arch/powerpc/include/asm/spinlock.h
index 5f54a74..f6e78d6 100644
--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h
@@ -28,6 +28,8 @@
#include <asm/synch.h>
#include <asm/ppc-opcode.h>
+#define smp_mb__after_unlock_lock() smp_mb() /* Full ordering for lock. */
+
#define arch_spin_is_locked(x) ((x)->slock != 0)
#ifdef CONFIG_PPC64
--
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