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=-8.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 063BEC2B9F4 for ; Fri, 18 Jun 2021 00:07:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B2475613BD for ; Fri, 18 Jun 2021 00:07:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B2475613BD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4AA3A6B0071; Thu, 17 Jun 2021 20:07:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 481DA6B0072; Thu, 17 Jun 2021 20:07:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2FBBF6B0073; Thu, 17 Jun 2021 20:07:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0215.hostedemail.com [216.40.44.215]) by kanga.kvack.org (Postfix) with ESMTP id F00836B0071 for ; Thu, 17 Jun 2021 20:07:06 -0400 (EDT) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 8830C83F7 for ; Fri, 18 Jun 2021 00:07:06 +0000 (UTC) X-FDA: 78264904452.29.B244745 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf18.hostedemail.com (Postfix) with ESMTP id 35B692001096 for ; Fri, 18 Jun 2021 00:07:06 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id DD04D6100B; Fri, 18 Jun 2021 00:07:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623974825; bh=fT8ghO62wb94wjF8ctHeOg9HOsl4L7WzRtohgUOi5/8=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=u+2cCEeGOslzcT3MOai11g8eYsZQVyTkmi68V1F4C5mLvcjJw4ykuETJ2VmcyJ8d0 b7jT+VUWxMUzYERgR8cODWpemiItXCVso0PP6LPVDo8m3YhiSdv4MPgAAdvcIEG2T+ GzCdnxyxKIusqCNObPKwZAnArvzamYczQJacYb7KRXAX9ANr9b15PxzV1cxVTo2iIs I9R9hcjCKd84To6FaRfWBdkQC5rbt15yPu8IBQ/Ah32IrU4rNTm8QWkXfB01CtBk/9 xaQr+jrgu6ve5GIylpygghBCTHUGMXtbMj3jhCPlIRG8pVytXSpe5sk8iyDNIJC+ND cF2DLkzSkiSYg== Subject: Re: [PATCH 7/8] membarrier: Remove arm (32) support for SYNC_CORE To: x86@kernel.org Cc: Dave Hansen , LKML , linux-mm@kvack.org, Andrew Morton , Mathieu Desnoyers , Nicholas Piggin , Peter Zijlstra , Russell King , linux-arm-kernel@lists.infradead.org References: <2142129092ff9aa00e600c42a26c4015b7f5ceec.1623813516.git.luto@kernel.org> From: Andy Lutomirski Message-ID: Date: Thu, 17 Jun 2021 17:07:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <2142129092ff9aa00e600c42a26c4015b7f5ceec.1623813516.git.luto@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=u+2cCEeG; spf=pass (imf18.hostedemail.com: domain of luto@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=luto@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Stat-Signature: oajqpawy9cthc4xkhb1w9x3e4u4nsmfr X-Rspamd-Queue-Id: 35B692001096 X-Rspamd-Server: rspam06 X-HE-Tag: 1623974826-267532 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/15/21 8:21 PM, Andy Lutomirski wrote: > On arm32, the only way to safely flush icache from usermode is to call > cacheflush(2). This also handles any required pipeline flushes, so > membarrier's SYNC_CORE feature is useless on arm. Remove it. After all the discussion, I'm dropping this patch.