From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 529FBC2D0DB for ; Wed, 29 Jan 2020 19:03:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34BDA206D4 for ; Wed, 29 Jan 2020 19:03:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728432AbgA2TDk (ORCPT ); Wed, 29 Jan 2020 14:03:40 -0500 Received: from coyote.holtmann.net ([212.227.132.17]:49812 "EHLO mail.holtmann.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727617AbgA2TDk (ORCPT ); Wed, 29 Jan 2020 14:03:40 -0500 Received: from marcel-macpro.fritz.box (p4FEFC5A7.dip0.t-ipconnect.de [79.239.197.167]) by mail.holtmann.org (Postfix) with ESMTPSA id 31DB1CECC9; Wed, 29 Jan 2020 20:12:59 +0100 (CET) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.40.2.2.4\)) Subject: Re: [PATCH] bluetooth: optimize barrier usage for Rmw atomics From: Marcel Holtmann In-Reply-To: <20200129181041.24853-1-dave@stgolabs.net> Date: Wed, 29 Jan 2020 20:03:38 +0100 Cc: Johan Hedberg , linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, Davidlohr Bueso Content-Transfer-Encoding: 7bit Message-Id: <3824A860-1ACD-479C-A862-E1449D49BC05@holtmann.org> References: <20200129181041.24853-1-dave@stgolabs.net> To: Davidlohr Bueso X-Mailer: Apple Mail (2.3608.40.2.2.4) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Davidlohr, > Use smp_mb__before_atomic() instead of smp_mb() and avoid the > unnecessary barrier for non LL/SC architectures, such as x86. > > Signed-off-by: Davidlohr Bueso > --- > net/bluetooth/hidp/core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) patch has been applied to bluetooth-next tree. Regards Marcel