From: Michal Hocko <mhocko@xxxxxxxx> which uses the same fast path as __down_write except it falls back to rwsem_down_write_failed_killable slow path and return -EINTR if killed. Signed-off-by: Michal Hocko <mhocko@xxxxxxxx> --- arch/xtensa/include/asm/rwsem.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/xtensa/include/asm/rwsem.h b/arch/xtensa/include/asm/rwsem.h index 593483f6e1ff..6283823b8040 100644 --- a/arch/xtensa/include/asm/rwsem.h +++ b/arch/xtensa/include/asm/rwsem.h @@ -59,6 +59,19 @@ static inline void __down_write(struct rw_semaphore *sem) rwsem_down_write_failed(sem); } +static inline int __down_write_killable(struct rw_semaphore *sem) +{ + int tmp; + + tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS, + (atomic_t *)(&sem->count)); + if (tmp != RWSEM_ACTIVE_WRITE_BIAS) + if (IS_ERR(rwsem_down_write_failed_killable(sem))) + return -EINTR; + + return 0; +} + static inline int __down_write_trylock(struct rw_semaphore *sem) { int tmp; -- 2.8.0.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html