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| author | Kirill Tkhai <ktkhai@virtuozzo.com> | 2017-09-29 19:06:18 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-10-10 11:50:15 +0200 |
| commit | a61ba2c8a48f150f5e6b6d14328fc7f1aa32969d (patch) | |
| tree | 8d4a5fbd980c92bbc709a0d633eaa0ecdf30cd28 /arch/s390 | |
| parent | c0905115a55c8a3011d7b7e6ee5d63653c1e99f1 (diff) | |
| download | blackbird-op-linux-a61ba2c8a48f150f5e6b6d14328fc7f1aa32969d.tar.gz blackbird-op-linux-a61ba2c8a48f150f5e6b6d14328fc7f1aa32969d.zip | |
locking/arch, s390: 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/150670117817.23930.13068785028558453848.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/rwsem.h | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h index 597e7e96b59e..fda9481dec5c 100644 --- a/arch/s390/include/asm/rwsem.h +++ b/arch/s390/include/asm/rwsem.h @@ -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 */ |
