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locking/rwsem, alpha: Provide __down_write_killable()

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Introduce ___down_write() for the fast path and reuse it for __down_write()
resp. __down_write_killable() each using the respective generic slow path
(rwsem_down_write_failed() resp. rwsem_down_write_failed_killable()).

Signed-off-by: Michal Hocko <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Max Filippov <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Signed-off-by: Davidlohr Bueso <[email protected]>
Cc: Signed-off-by: Jason Low <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Michal Hocko 2016-04-07 17:12:27 +02:00 • committed by Ingo Molnar
commit 7deb5eebc1
1 changed files with 16 additions and 2 deletions
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18
arch/alpha/include/asm/rwsem.h
View file

@ -63,7 +63,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
return res >= 0 ? 1 : 0;
}
static inline void __down_write(struct rw_semaphore *sem)
static inline long ___down_write(struct rw_semaphore *sem)
{
long oldcount;
#ifndef CONFIG_SMP
@ -83,10 +83,24 @@ static inline void __down_write(struct rw_semaphore *sem)
:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
:"Ir" (RWSEM_ACTIVE_WRITE_BIAS), "m" (sem->count) : "memory");
#endif
if (unlikely(oldcount))
return oldcount;
}
static inline void __down_write(struct rw_semaphore *sem)
{
if (unlikely(___down_write(sem)))
rwsem_down_write_failed(sem);
}
static inline int __down_write_killable(struct rw_semaphore *sem)
{
if (unlikely(___down_write(sem)))
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
return 0;
}
/*
* trylock for writing -- returns 1 if successful, 0 if contention
*/