From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f65.google.com ([74.125.82.65]:35796 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933553AbcBBUTv (ORCPT ); Tue, 2 Feb 2016 15:19:51 -0500 From: Michal Hocko Subject: [RFC 08/12] sparc, rwsem: provide __down_write_killable Date: Tue, 2 Feb 2016 21:19:25 +0100 Message-ID: <1454444369-2146-9-git-send-email-mhocko@kernel.org> In-Reply-To: <1454444369-2146-1-git-send-email-mhocko@kernel.org> References: <1454444369-2146-1-git-send-email-mhocko@kernel.org> Sender: linux-arch-owner@vger.kernel.org List-ID: 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 Message-ID: <20160202201925.AfujgtWoNLN4mDEyGWVy9nC9SHCfackVe8BNFI0Qneg@z> 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/sparc/include/asm/rwsem.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/sparc/include/asm/rwsem.h b/arch/sparc/include/asm/rwsem.h index e5a0d575bc7f..c1e9e32e8b63 100644 --- a/arch/sparc/include/asm/rwsem.h +++ b/arch/sparc/include/asm/rwsem.h @@ -55,6 +55,19 @@ static inline void __down_write(struct rw_semaphore *sem) rwsem_down_write_failed(sem); } +static inline int __down_write_killable(struct rw_semaphore *sem) +{ + long tmp; + + tmp = atomic64_add_return(RWSEM_ACTIVE_WRITE_BIAS, + (atomic64_t *)(&sem->count)); + if (unlikely(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) { long tmp; -- 2.7.0