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author | David S. Miller <davem@davemloft.net> | 2005-07-25 02:35:42 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2005-07-25 02:35:42 (GMT) |
commit | 620de54675e76f1369326bbe1fc75aff88917063 (patch) | |
tree | e50b449c94843e15c4dfa964ada5b50f1876e497 /include | |
parent | 6593eaed814d50214d6056c683d52ac63153730e (diff) | |
download | linux-fsl-qoriq-620de54675e76f1369326bbe1fc75aff88917063.tar.xz |
[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 <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r-- | include/asm-sparc64/rwsem.h | 48 |
1 files changed, 4 insertions, 44 deletions
diff --git a/include/asm-sparc64/rwsem.h b/include/asm-sparc64/rwsem.h index a1cc94f..4568ee4 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__ */ |