From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754336AbcEQAqr (ORCPT ); Mon, 16 May 2016 20:46:47 -0400 Received: from g1t6225.austin.hp.com ([15.73.96.126]:52460 "EHLO g1t6225.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753854AbcEQAqp (ORCPT ); Mon, 16 May 2016 20:46:45 -0400 From: Jason Low To: Peter Zijlstra , Ingo Molnar Cc: linux-kernel@vger.kernel.org, Andrew Morton , Richard Henderson , Linus Torvalds , Ivan Kokshaysky , Matt Turner , Tony Luck , Fenghua Yu , Martin Schwidefsky , Terry Rudd , Heiko Carstens , Thomas Gleixner , Arnd Bergmann , Christoph Lameter , Davidlohr Bueso , Waiman Long , Tim Chen , Peter Hurley , Jason Low , Jason Low Subject: [RFC][PATCH 3/7] locking,x86: Remove x86 rwsem add and rwsem update Date: Mon, 16 May 2016 17:38:02 -0700 Message-Id: <1463445486-16078-4-git-send-email-jason.low2@hpe.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1463445486-16078-1-git-send-email-jason.low2@hpe.com> References: <1463445486-16078-1-git-send-email-jason.low2@hpe.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The rwsem count has been converted to an atomic variable and the rwsem code now directly uses atomic_long_add() and atomic_long_add_return(), so we can remove the x86 implementation of rwsem_atomic_add() and rwsem_atomic_update(). Signed-off-by: Jason Low --- arch/x86/include/asm/rwsem.h | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/arch/x86/include/asm/rwsem.h b/arch/x86/include/asm/rwsem.h index d2f8d10..91cf42c 100644 --- a/arch/x86/include/asm/rwsem.h +++ b/arch/x86/include/asm/rwsem.h @@ -215,23 +215,5 @@ static inline void __downgrade_write(struct rw_semaphore *sem) : "memory", "cc"); } -/* - * implement atomic add functionality - */ -static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem) -{ - asm volatile(LOCK_PREFIX _ASM_ADD "%1,%0" - : "+m" (sem->count) - : "er" (delta)); -} - -/* - * implement exchange and add functionality - */ -static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem) -{ - return delta + xadd(&sem->count, delta); -} - #endif /* __KERNEL__ */ #endif /* _ASM_X86_RWSEM_H */ -- 2.1.4