From: tip-bot for Peter Zijlstra <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org,
torvalds@linux-foundation.org, peterz@infradead.org,
paulmck@linux.vnet.ibm.com, hskinnemoen@gmail.com,
tglx@linutronix.de, egtvedt@samfundet.no
Subject: [tip:locking/core] arch,avr32: Convert smp_mb__*()
Date: Fri, 18 Apr 2014 06:05:23 -0700 [thread overview]
Message-ID: <tip-8gow97a7mapmnec0pvf729pj@git.kernel.org> (raw)
Commit-ID: 710adaa913169d7183cdf0de41c2a349101ff615
Gitweb: http://git.kernel.org/tip/710adaa913169d7183cdf0de41c2a349101ff615
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Thu, 13 Mar 2014 19:00:37 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 18 Apr 2014 11:40:33 +0200
arch,avr32: Convert smp_mb__*()
AVR32's mb() implementation is a compiler barrier(), therefore it all
doesn't matter, fully rely on whatever asm-generic/barrier.h
generates.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-8gow97a7mapmnec0pvf729pj@git.kernel.org
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/avr32/include/asm/atomic.h | 5 -----
arch/avr32/include/asm/bitops.h | 9 ++-------
2 files changed, 2 insertions(+), 12 deletions(-)
diff --git a/arch/avr32/include/asm/atomic.h b/arch/avr32/include/asm/atomic.h
index 6140727..0780f3f 100644
--- a/arch/avr32/include/asm/atomic.h
+++ b/arch/avr32/include/asm/atomic.h
@@ -183,9 +183,4 @@ static inline int atomic_sub_if_positive(int i, atomic_t *v)
#define atomic_dec_if_positive(v) atomic_sub_if_positive(1, v)
-#define smp_mb__before_atomic_dec() barrier()
-#define smp_mb__after_atomic_dec() barrier()
-#define smp_mb__before_atomic_inc() barrier()
-#define smp_mb__after_atomic_inc() barrier()
-
#endif /* __ASM_AVR32_ATOMIC_H */
diff --git a/arch/avr32/include/asm/bitops.h b/arch/avr32/include/asm/bitops.h
index ebe7ad3..910d537 100644
--- a/arch/avr32/include/asm/bitops.h
+++ b/arch/avr32/include/asm/bitops.h
@@ -13,12 +13,7 @@
#endif
#include <asm/byteorder.h>
-
-/*
- * clear_bit() doesn't provide any barrier for the compiler
- */
-#define smp_mb__before_clear_bit() barrier()
-#define smp_mb__after_clear_bit() barrier()
+#include <asm/barrier.h>
/*
* set_bit - Atomically set a bit in memory
@@ -67,7 +62,7 @@ static inline void set_bit(int nr, volatile void * addr)
*
* clear_bit() is atomic and may not be reordered. However, it does
* not contain a memory barrier, so if it is used for locking purposes,
- * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
+ * you should call smp_mb__before_atomic() and/or smp_mb__after_atomic()
* in order to ensure changes are visible on other processors.
*/
static inline void clear_bit(int nr, volatile void * addr)
next reply other threads:[~2014-04-18 13:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-18 13:05 tip-bot for Peter Zijlstra [this message]
2014-04-21 19:28 ` [tip:locking/core] arch,avr32: Convert smp_mb__*() Hans-Christian Egtvedt
2014-04-22 5:03 ` Ingo Molnar
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