lcoking/barriers, arch: Use smp barriers in smp_store_release()
With commit b92b8b35a2
("locking/arch: Rename set_mb() to smp_store_mb()")
it was made clear that the context of this call (and thus set_mb)
is strictly for CPU ordering, as opposed to IO. As such all archs
should use the smp variant of mb(), respecting the semantics and
saving a mandatory barrier on UP.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <linux-arch@vger.kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: dave@stgolabs.net
Link: http://lkml.kernel.org/r/1445975631-17047-3-git-send-email-dave@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
parent
afd2ff9b7e
commit
5a1b26d7c6
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@ -77,7 +77,7 @@ do { \
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___p1; \
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})
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); mb(); } while (0)
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
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/*
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* The group barrier in front of the rsm & ssm are necessary to ensure
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@ -34,7 +34,7 @@
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#define rmb() __asm__ __volatile__ ("sync" : : : "memory")
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#define wmb() __asm__ __volatile__ ("sync" : : : "memory")
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); mb(); } while (0)
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
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#ifdef __SUBARCH_HAS_LWSYNC
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# define SMPWMB LWSYNC
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@ -36,7 +36,7 @@
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#define smp_mb__before_atomic() smp_mb()
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#define smp_mb__after_atomic() smp_mb()
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); mb(); } while (0)
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
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#define smp_store_release(p, v) \
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do { \
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@ -93,7 +93,7 @@
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#endif /* CONFIG_SMP */
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#ifndef smp_store_mb
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); mb(); } while (0)
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
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#endif
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#ifndef smp_mb__before_atomic
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