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Subject[RFC][PATCH 3/7] locking,x86: Remove x86 rwsem add and rwsem update
Date
The rwsem count has been converted to an atomic variable and the rwsem
code now directly uses atomic_long_add() and atomic_long_add_return(),
so we can remove the x86 implementation of rwsem_atomic_add() and
rwsem_atomic_update().

Signed-off-by: Jason Low <jason.low2@hpe.com>
---
arch/x86/include/asm/rwsem.h | 18 ------------------
1 file changed, 18 deletions(-)

diff --git a/arch/x86/include/asm/rwsem.h b/arch/x86/include/asm/rwsem.h
index d2f8d10..91cf42c 100644
--- a/arch/x86/include/asm/rwsem.h
+++ b/arch/x86/include/asm/rwsem.h
@@ -215,23 +215,5 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
: "memory", "cc");
}

-/*
- * implement atomic add functionality
- */
-static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
-{
- asm volatile(LOCK_PREFIX _ASM_ADD "%1,%0"
- : "+m" (sem->count)
- : "er" (delta));
-}
-
-/*
- * implement exchange and add functionality
- */
-static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
-{
- return delta + xadd(&sem->count, delta);
-}
-
#endif /* __KERNEL__ */
#endif /* _ASM_X86_RWSEM_H */
--
2.1.4
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