From 620de54675e76f1369326bbe1fc75aff88917063 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sun, 24 Jul 2005 19:35:42 -0700 Subject: [SPARC64]: Simplify asm/rwsem.h slightly. rwsem_atomic_update and rwsem_atomic_add can be implemented straightly using atomic_*() routines. Also, rwsem_cmpxchgw() is totally unused, kill it. Signed-off-by: David S. Miller --- include/asm-sparc64/rwsem.h | 48 ++++----------------------------------------- 1 file changed, 4 insertions(+), 44 deletions(-) (limited to 'include/asm-sparc64') diff --git a/include/asm-sparc64/rwsem.h b/include/asm-sparc64/rwsem.h index a1cc94f95984..4568ee4022df 100644 --- a/include/asm-sparc64/rwsem.h +++ b/include/asm-sparc64/rwsem.h @@ -46,54 +46,14 @@ extern void __up_read(struct rw_semaphore *sem); extern void __up_write(struct rw_semaphore *sem); extern void __downgrade_write(struct rw_semaphore *sem); -static __inline__ int rwsem_atomic_update(int delta, struct rw_semaphore *sem) +static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem) { - int tmp = delta; - - __asm__ __volatile__( - "1:\tlduw [%2], %%g1\n\t" - "add %%g1, %1, %%g7\n\t" - "cas [%2], %%g1, %%g7\n\t" - "cmp %%g1, %%g7\n\t" - "membar #StoreLoad | #StoreStore\n\t" - "bne,pn %%icc, 1b\n\t" - " nop\n\t" - "mov %%g7, %0\n\t" - : "=&r" (tmp) - : "0" (tmp), "r" (sem) - : "g1", "g7", "memory", "cc"); - - return tmp + delta; -} - -#define rwsem_atomic_add rwsem_atomic_update - -static __inline__ __u16 rwsem_cmpxchgw(struct rw_semaphore *sem, __u16 __old, __u16 __new) -{ - u32 old = (sem->count & 0xffff0000) | (u32) __old; - u32 new = (old & 0xffff0000) | (u32) __new; - u32 prev; - -again: - __asm__ __volatile__("cas [%2], %3, %0\n\t" - "membar #StoreLoad | #StoreStore" - : "=&r" (prev) - : "0" (new), "r" (sem), "r" (old) - : "memory"); - - /* To give the same semantics as x86 cmpxchgw, keep trying - * if only the upper 16-bits changed. - */ - if (prev != old && - ((prev & 0xffff) == (old & 0xffff))) - goto again; - - return prev & 0xffff; + return atomic_add_return(delta, (atomic_t *)(&sem->count)); } -static __inline__ signed long rwsem_cmpxchg(struct rw_semaphore *sem, signed long old, signed long new) +static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem) { - return cmpxchg(&sem->count,old,new); + atomic_add(delta, (atomic_t *)(&sem->count)); } #endif /* __KERNEL__ */ -- cgit v1.2.1