From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Hocko Subject: [RFC 09/12] xtensa, rwsem: provide __down_write_killable Date: Tue, 2 Feb 2016 21:19:26 +0100 Message-ID: <1454444369-2146-10-git-send-email-mhocko@kernel.org> References: <1454444369-2146-1-git-send-email-mhocko@kernel.org> Return-path: In-Reply-To: <1454444369-2146-1-git-send-email-mhocko@kernel.org> Sender: linux-sh-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: LKML Cc: Peter Zijlstra , Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , "David S. Miller" , Tony Luck , Andrew Morton , Chris Zankel , Max Filippov , x86@kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org, Michal Hocko From: Michal Hocko which is 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 --- 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; -- 2.7.0