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| author | Kirill Tkhai <ktkhai@virtuozzo.com> | 2017-09-29 19:05:56 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-10-10 12:50:14 +0300 |
| commit | 8c74392a8db9f19f7b2d07f3bb7c5accb4cb4702 (patch) | |
| tree | 1db1c958f2a6100f3ddd5b12f4ba7c817b0d7595 /arch/alpha | |
| parent | e6fd28eb3522b31f79a938e24674f77268a120fd (diff) | |
| download | linux-8c74392a8db9f19f7b2d07f3bb7c5accb4cb4702.tar.xz | |
locking/arch, alpha: 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/150670115677.23930.5711263025537758463.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/alpha')
| -rw-r--r-- | arch/alpha/include/asm/rwsem.h | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/arch/alpha/include/asm/rwsem.h b/arch/alpha/include/asm/rwsem.h index 77873d0ad293..9624cb4cbf2f 100644 --- a/arch/alpha/include/asm/rwsem.h +++ b/arch/alpha/include/asm/rwsem.h @@ -21,7 +21,7 @@ #define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS #define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) -static inline void __down_read(struct rw_semaphore *sem) +static inline int ___down_read(struct rw_semaphore *sem) { long oldcount; #ifndef CONFIG_SMP @@ -41,10 +41,24 @@ static inline void __down_read(struct rw_semaphore *sem) :"=&r" (oldcount), "=m" (sem->count), "=&r" (temp) :"Ir" (RWSEM_ACTIVE_READ_BIAS), "m" (sem->count) : "memory"); #endif - if (unlikely(oldcount < 0)) + return (oldcount < 0); +} + +static inline void __down_read(struct rw_semaphore *sem) +{ + if (unlikely(___down_read(sem))) rwsem_down_read_failed(sem); } +static inline int __down_read_killable(struct rw_semaphore *sem) +{ + if (unlikely(___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 */ @@ -94,9 +108,10 @@ static inline void __down_write(struct rw_semaphore *sem) static inline int __down_write_killable(struct rw_semaphore *sem) { - if (unlikely(___down_write(sem))) + if (unlikely(___down_write(sem))) { if (IS_ERR(rwsem_down_write_failed_killable(sem))) return -EINTR; + } return 0; } |