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authorKirill Tkhai <ktkhai@virtuozzo.com>2017-09-29 19:06:38 +0300
committerIngo Molnar <mingo@kernel.org>2017-10-10 11:50:16 +0200
commit76f8507f7a6442215df19de74f07eabca2462f1e (patch)
tree89d418742e8c8c6480ca3a478b77f53338bc2672 /include/asm-generic/rwsem.h
parent19c60923010b3f56f10ca1fb6d537c9cc852b3f1 (diff)
locking/rwsem: Add down_read_killable()
Similar to down_read() and down_write_killable(), add killable version of down_read(), based on __down_read_killable() function, added in previous patches. 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/150670119884.23930.2585570605960763239.stgit@localhost.localdomain Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/asm-generic/rwsem.h')
-rw-r--r--include/asm-generic/rwsem.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-generic/rwsem.h b/include/asm-generic/rwsem.h
index 6c6a2141f271..b2d68d2d198e 100644
--- a/include/asm-generic/rwsem.h
+++ b/include/asm-generic/rwsem.h
@@ -37,6 +37,16 @@ static inline void __down_read(struct rw_semaphore *sem)
rwsem_down_read_failed(sem);
}
+static inline int __down_read_killable(struct rw_semaphore *sem)
+{
+ if (unlikely(atomic_long_inc_return_acquire(&sem->count) <= 0)) {
+ if (IS_ERR(rwsem_down_read_failed_killable(sem)))
+ return -EINTR;
+ }
+
+ return 0;
+}
+
static inline int __down_read_trylock(struct rw_semaphore *sem)
{
long tmp;