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

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Date:	Fri, 18 Apr 2014 06:05:39 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mathieu.desnoyers@...ymtl.ca, linux-kernel@...r.kernel.org,
	hpa@...or.com, mingo@...nel.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, paulmck@...ux.vnet.ibm.com,
	geert@...ux-m68k.org, realmz6@...il.com, tglx@...utronix.de
Subject: [tip:locking/core] arch,blackfin: Convert smp_mb__*()

Commit-ID:  b7bb7d9b28f6278625fbe7892b8c7799bb12a26a
Gitweb:     http://git.kernel.org/tip/b7bb7d9b28f6278625fbe7892b8c7799bb12a26a
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu, 13 Mar 2014 19:00:37 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 18 Apr 2014 11:40:34 +0200

arch,blackfin: Convert smp_mb__*()

Blackfin's atomic primitives do not imply a full barrier as whitnessed
from its SMP smp_mb__{before,after}_clear_bit() implementations.

However since !SMP smp_mb() reduces to barrier() remove everything and
rely on the asm-generic/barrier.h implentation.

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-1widdkdsb3c1titq8jez6g3g@git.kernel.org
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc: Steven Miao <realmz6@...il.com>
Cc: adi-buildroot-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/blackfin/include/asm/barrier.h |  3 +++
 arch/blackfin/include/asm/bitops.h  | 14 ++------------
 2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/arch/blackfin/include/asm/barrier.h b/arch/blackfin/include/asm/barrier.h
index 19283a1..4200068 100644
--- a/arch/blackfin/include/asm/barrier.h
+++ b/arch/blackfin/include/asm/barrier.h
@@ -27,6 +27,9 @@
 
 #endif /* !CONFIG_SMP */
 
+#define smp_mb__before_atomic()	barrier()
+#define smp_mb__after_atomic()	barrier()
+
 #include <asm-generic/barrier.h>
 
 #endif /* _BLACKFIN_BARRIER_H */
diff --git a/arch/blackfin/include/asm/bitops.h b/arch/blackfin/include/asm/bitops.h
index 0ca40dd..b298b65 100644
--- a/arch/blackfin/include/asm/bitops.h
+++ b/arch/blackfin/include/asm/bitops.h
@@ -27,21 +27,17 @@
 
 #include <asm-generic/bitops/ext2-atomic.h>
 
+#include <asm/barrier.h>
+
 #ifndef CONFIG_SMP
 #include <linux/irqflags.h>
-
 /*
  * clear_bit may not imply a memory barrier
  */
-#ifndef smp_mb__before_clear_bit
-#define smp_mb__before_clear_bit()	smp_mb()
-#define smp_mb__after_clear_bit()	smp_mb()
-#endif
 #include <asm-generic/bitops/atomic.h>
 #include <asm-generic/bitops/non-atomic.h>
 #else
 
-#include <asm/barrier.h>
 #include <asm/byteorder.h>	/* swab32 */
 #include <linux/linkage.h>
 
@@ -101,12 +97,6 @@ static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
 	return __raw_bit_test_toggle_asm(a, nr & 0x1f);
 }
 
-/*
- * clear_bit() doesn't provide any barrier for the compiler.
- */
-#define smp_mb__before_clear_bit()	barrier()
-#define smp_mb__after_clear_bit()	barrier()
-
 #define test_bit __skip_test_bit
 #include <asm-generic/bitops/non-atomic.h>
 #undef test_bit
--
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