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locking/arch, s390: Add __down_read_killable()

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Similar to __down_write_killable(), and read killable primitive.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: arnd@arndb.de
Cc: avagin@virtuozzo.com
Cc: davem@davemloft.net
Cc: fenghua.yu@intel.com
Cc: gorcunov@virtuozzo.com
Cc: heiko.carstens@de.ibm.com
Cc: hpa@zytor.com
Cc: ink@jurassic.park.msu.ru
Cc: mattst88@gmail.com
Cc: rientjes@google.com
Cc: rth@twiddle.net
Cc: schwidefsky@de.ibm.com
Cc: tony.luck@intel.com
Cc: viro@zeniv.linux.org.uk
Link: http://lkml.kernel.org/r/150670117817.23930.13068785028558453848.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill Tkhai 2017-09-29 19:06:18 +03:00 committed by Ingo Molnar
parent c0905115a5
commit a61ba2c8a4
1 changed files with 17 additions and 2 deletions
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19
arch/s390/include/asm/rwsem.h
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@ -49,7 +49,7 @@
/*
* lock for reading
*/
static inline void __down_read(struct rw_semaphore *sem)
static inline int ___down_read(struct rw_semaphore *sem)
{
signed long old, new;
@ -62,10 +62,25 @@ static inline void __down_read(struct rw_semaphore *sem)
: "=&d" (old), "=&d" (new), "=Q" (sem->count)
: "Q" (sem->count), "i" (RWSEM_ACTIVE_READ_BIAS)
: "cc", "memory");
if (old < 0)
return (old < 0);
}
static inline void __down_read(struct rw_semaphore *sem)
{
if (___down_read(sem))
rwsem_down_read_failed(sem);
}
static inline int __down_read_killable(struct rw_semaphore *sem)
{
if (___down_read(sem)) {
if (IS_ERR(rwsem_down_read_failed_killable(sem)))
return -EINTR;
}
return 0;
}
/*
* trylock for reading -- returns 1 if successful, 0 if contention
*/