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arch,sparc: Convert smp_mb__*()

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sparc32: fully relies on asm-generic/barrier.h and thus can use its
	 implementation.

sparc64: is strongly ordered and its atomic ops imply a full barrier,
	 implement the new primitives using barrier().

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/n/tip-2cla9ubpd8chrntnm7e4zdt4@git.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2014-03-13 19:00:35 +01:00
committed by Ingo Molnar
parent 603228bcb8
commit 56d3648948
5 changed files with 6 additions and 18 deletions
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7
arch/sparc/include/asm/atomic_32.h
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@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <asm/cmpxchg.h>
#include <asm/barrier.h>
#include <asm-generic/atomic64.h>
@@ -52,10 +53,4 @@ extern void atomic_set(atomic_t *, int);
#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
/* Atomic operations are already serializing */
#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 /* !(__ARCH_SPARC_ATOMIC__) */