From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755169AbdCGIxn (ORCPT ); Tue, 7 Mar 2017 03:53:43 -0500 Received: from terminus.zytor.com ([65.50.211.136]:34642 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755218AbdCGIxf (ORCPT ); Tue, 7 Mar 2017 03:53:35 -0500 Date: Mon, 6 Mar 2017 23:30:48 -0800 From: tip-bot for Arnaldo Carvalho de Melo Message-ID: Cc: linux-kernel@vger.kernel.org, acme@redhat.com, elena.reshetova@intel.com, hpa@zytor.com, dsahern@gmail.com, wangnan0@huawei.com, tglx@linutronix.de, peterz@infradead.org, namhyung@kernel.org, jolsa@kernel.org, mingo@kernel.org, adrian.hunter@intel.com Reply-To: acme@redhat.com, elena.reshetova@intel.com, linux-kernel@vger.kernel.org, wangnan0@huawei.com, dsahern@gmail.com, hpa@zytor.com, mingo@kernel.org, jolsa@kernel.org, namhyung@kernel.org, adrian.hunter@intel.com, peterz@infradead.org, tglx@linutronix.de To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] tools include: Provide gcc based cmpxchg fallback for !x86 Git-Commit-ID: ed4aad50ea0384737034b39f952f29cfb2da52ac X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: ed4aad50ea0384737034b39f952f29cfb2da52ac Gitweb: http://git.kernel.org/tip/ed4aad50ea0384737034b39f952f29cfb2da52ac Author: Arnaldo Carvalho de Melo AuthorDate: Thu, 23 Feb 2017 15:33:02 -0300 Committer: Arnaldo Carvalho de Melo CommitDate: Fri, 3 Mar 2017 19:07:14 -0300 tools include: Provide gcc based cmpxchg fallback for !x86 We've been using an atomic_t implementation subset based on the gcc builtin functions for a while, now, with refcount.h we need cmpxchg(), use gcc's __sync_val_compare_and_swap() for that. Cc: Adrian Hunter Cc: David Ahern Cc: Elena Reshetova Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-b9zovyxgpa0c4vi3nm0kjo97@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/include/asm-generic/atomic-gcc.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/include/asm-generic/atomic-gcc.h b/tools/include/asm-generic/atomic-gcc.h index 2ba78c9..5e9738f 100644 --- a/tools/include/asm-generic/atomic-gcc.h +++ b/tools/include/asm-generic/atomic-gcc.h @@ -60,4 +60,12 @@ static inline int atomic_dec_and_test(atomic_t *v) return __sync_sub_and_fetch(&v->counter, 1) == 0; } +#define cmpxchg(ptr, oldval, newval) \ + __sync_val_compare_and_swap(ptr, oldval, newval) + +static inline int atomic_cmpxchg(atomic_t *v, int oldval, int newval) +{ + return cmpxchg(&(v)->counter, oldval, newval); +} + #endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */