[patch 072/115] frv: cmpxchg: implement cmpxchg64()

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From: Will Deacon <will.deacon@xxxxxxx>
Subject: frv: cmpxchg: implement cmpxchg64()

FRV supports 64-bit cmpxchg, which is provided by the arch code as
__cmpxchg_64 and subsequently used to implement atomic64_cmpxchg.

This patch hooks up the generic cmpxchg64 API using the same function,
which also provides default definitions of the relaxed, acquire and
release variants.  This fixes the build when COMPILE_TEST=y and
IOMMU_IO_PGTABLE_LPAE=y.

Link: http://lkml.kernel.org/r/1499084670-6996-1-git-send-email-will.deacon@xxxxxxx
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 arch/frv/include/asm/cmpxchg.h |    1 +
 1 file changed, 1 insertion(+)

diff -puN arch/frv/include/asm/cmpxchg.h~frv-cmpxchg-implement-cmpxchg64 arch/frv/include/asm/cmpxchg.h
--- a/arch/frv/include/asm/cmpxchg.h~frv-cmpxchg-implement-cmpxchg64
+++ a/arch/frv/include/asm/cmpxchg.h
@@ -76,6 +76,7 @@ extern uint32_t __xchg_32(uint32_t i, vo
  * - if (*ptr != test) then orig = *ptr;
  */
 extern uint64_t __cmpxchg_64(uint64_t test, uint64_t new, volatile uint64_t *v);
+#define cmpxchg64(p, o, n)	__cmpxchg_64((o), (n), (p))
 
 #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
 
_
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