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| author | Kirill Tkhai <ktkhai@virtuozzo.com> | 2017-09-29 19:06:07 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-10-10 12:50:14 +0300 |
| commit | c0905115a55c8a3011d7b7e6ee5d63653c1e99f1 (patch) | |
| tree | d72cdf6800b9100c210a1253d0a9bd0e401e95dd /arch/ia64/include | |
| parent | 8c74392a8db9f19f7b2d07f3bb7c5accb4cb4702 (diff) | |
| download | linux-c0905115a55c8a3011d7b7e6ee5d63653c1e99f1.tar.xz | |
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>
Diffstat (limited to 'arch/ia64/include')
| -rw-r--r-- | arch/ia64/include/asm/rwsem.h | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/arch/ia64/include/asm/rwsem.h b/arch/ia64/include/asm/rwsem.h index 8fa98dd303b4..49f7db0a1bcd 100644 --- a/arch/ia64/include/asm/rwsem.h +++ b/arch/ia64/include/asm/rwsem.h @@ -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; } |