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Subject[PATCH v2] arch: tile: include: asm: add cmpxchg64() definition
Need add cmpxchg64(), or will cause compiling issue.

Need define it as cmpxchg() only for 64-bit operation, since cmpxchg()
can support 8 bytes.

The related error (with allmodconfig):

drivers/block/blockconsole.c: In function ‘bcon_advance_console_bytes’:
drivers/block/blockconsole.c:164:2: error: implicit declaration of function ‘cmpxchg64’ [-Werror=implicit-function-declaration]

Signed-off-by: Chen Gang <gang.chen@asianux.com>
---
arch/tile/include/asm/cmpxchg.h | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/tile/include/asm/cmpxchg.h b/arch/tile/include/asm/cmpxchg.h
index 276f067..1da5bfb 100644
--- a/arch/tile/include/asm/cmpxchg.h
+++ b/arch/tile/include/asm/cmpxchg.h
@@ -68,6 +68,12 @@ extern unsigned long __cmpxchg_called_with_bad_pointer(void);

#define tas(ptr) (xchg((ptr), 1))

+#define cmpxchg64(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ cmpxchg((ptr), (o), (n)); \
+})
+
#endif /* __ASSEMBLY__ */

#endif /* _ASM_TILE_CMPXCHG_H */
--
1.7.7.6
--
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