linux-kernel - [tip:locking/core] arch,arc: Convert smp_mb_

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Date:	Fri, 18 Apr 2014 06:04:42 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	paulmck@...ux.vnet.ibm.com, vgupta@...opsys.com, tglx@...utronix.de
Subject: [tip:locking/core] arch,arc: Convert smp_mb__*()

Commit-ID:  d594ffa94b7efdd8c6da5ee48aea8ae229809b55
Gitweb:     http://git.kernel.org/tip/d594ffa94b7efdd8c6da5ee48aea8ae229809b55
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 12 Mar 2014 17:11:00 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 18 Apr 2014 11:40:31 +0200

arch,arc: Convert smp_mb__*()

The arc mb() implementation is a compiler barrier(), therefore it all
doesn't matter one way or the other. Simply remove the existing
definitions and use whatever is generated by the defaults.

Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-ua48a59wri3ybz1rz8i7uvbr@git.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Vineet Gupta <vgupta@...opsys.com>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/arc/include/asm/atomic.h | 5 -----
 arch/arc/include/asm/bitops.h | 5 +----
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/arch/arc/include/asm/atomic.h b/arch/arc/include/asm/atomic.h
index 03e494f..83f03ca 100644
--- a/arch/arc/include/asm/atomic.h
+++ b/arch/arc/include/asm/atomic.h
@@ -190,11 +190,6 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 
 #endif /* !CONFIG_ARC_HAS_LLSC */
 
-#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()
-
 /**
  * __atomic_add_unless - add unless the number is a given value
  * @v: pointer of type atomic_t
diff --git a/arch/arc/include/asm/bitops.h b/arch/arc/include/asm/bitops.h
index 647a83a..ebc0cf3 100644
--- a/arch/arc/include/asm/bitops.h
+++ b/arch/arc/include/asm/bitops.h
@@ -19,6 +19,7 @@
 
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <asm/barrier.h>
 
 /*
  * Hardware assisted read-modify-write using ARC700 LLOCK/SCOND insns.
@@ -496,10 +497,6 @@ static inline __attribute__ ((const)) int __ffs(unsigned long word)
  */
 #define ffz(x)	__ffs(~(x))
 
-/* TODO does this affect uni-processor code */
-#define smp_mb__before_clear_bit()  barrier()
-#define smp_mb__after_clear_bit()   barrier()
-
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/fls64.h>
 #include <asm-generic/bitops/sched.h>
--
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