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locking/arch, ia64: Add __down_read_killable() 

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/150670116749.23930.14976888440968191759.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill Tkhai 2017-09-29 19:06:07 +03:00 committed by Ingo Molnar
parent 8c74392a8d
commit c0905115a5
1 changed files with 21 additions and 4 deletions
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25
arch/ia64/include/asm/rwsem.h
View File

@ -37,15 +37,31 @@
/*
* lock for reading
*/
static inline void
__down_read (struct rw_semaphore *sem)
static inline int
___down_read (struct rw_semaphore *sem)
{
long result = ia64_fetchadd8_acq((unsigned long *)&sem->count.counter, 1);
if (result < 0)
return (result < 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;
}
/*
* lock for writing
*/
@ -72,9 +88,10 @@ __down_write (struct rw_semaphore *sem)
static inline int
__down_write_killable (struct rw_semaphore *sem)
{
if (___down_write(sem))
if (___down_write(sem)) {
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
return -EINTR;
}
return 0;
}