From mboxrd@z Thu Jan 1 00:00:00 1970 From: Will Deacon Subject: [PATCH 06/13] READ_ONCE: Remove smp_read_barrier_depends() invocation Date: Fri, 8 Nov 2019 17:01:13 +0000 Message-ID: <20191108170120.22331-7-will@kernel.org> References: <20191108170120.22331-1-will@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573232509; bh=QmHkYOpw1KGgzE2tChTjH11DwvScC47O6EYYkdjmNZY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oiUzlVfUY9/EMo4arLdR3YvvgWtVrcBioNWxyo4tDqVikPDfd/hMfuNPavpmeFf5b fiotcwLuwgXiNdGNjLCGDs4cH4YGNrU4D2GdrgLklRE5kQEyEWDKv6ShvlqifQtJp8 C/qEBtT80YOw5LyKOpZZ03WsFbgZ4XIOvxTT9/+E= In-Reply-To: <20191108170120.22331-1-will@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-kernel@vger.kernel.org Cc: Will Deacon , Yunjae Lee , SeongJae Park , "Paul E. McKenney" , Josh Triplett , Matt Turner , Ivan Kokshaysky , Richard Henderson , Peter Zijlstra , Alan Stern , Michael Ellerman , "Michael S. Tsirkin" , Jason Wang , Arnd Bergmann , Joe Perches , Boqun Feng , linux-alpha@vger.kernel.org, virtualization@lists.linux-foundation.org Alpha overrides '__read_once_size_n()' directly, so there's no need to use 'smp_read_barrier_depends()' in the core code. Signed-off-by: Will Deacon --- include/asm-generic/rwonce.h | 1 - 1 file changed, 1 deletion(-) diff --git a/include/asm-generic/rwonce.h b/include/asm-generic/rwonce.h index 2c2ac0948c94..2e3289268a89 100644 --- a/include/asm-generic/rwonce.h +++ b/include/asm-generic/rwonce.h @@ -102,7 +102,6 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s __read_once_size(&(x), __u.__c, sizeof(x)); \ else \ __read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \ - smp_read_barrier_depends(); /* Enforce dependency ordering from x */ \ __u.__val; \ }) #define READ_ONCE(x) __READ_ONCE(x, 1) -- 2.24.0.rc1.363.gb1bccd3e3d-goog