Received: by 2002:a05:6a10:206:0:0:0:0 with SMTP id 6csp1010531pxj; Thu, 17 Jun 2021 20:05:46 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw096rpt1e5/uphpkHi0RCST2L9T9bUwLcnh0imM1PbYMhgazS1sNqxpcA2RaEd6Lq/tcGB X-Received: by 2002:aa7:d288:: with SMTP id w8mr1975488edq.276.1623985545857; Thu, 17 Jun 2021 20:05:45 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1623985545; cv=none; d=google.com; s=arc-20160816; b=vpzVVcRHpqeL+LxE4YvLQddi88tsxJRfd87On6cpXOzIPYq/JDP6kXgA4hIZQizdBn qtQVFvH91328Fx6eLe8cQsXI9jcZFWAwpyhLl5v2hTlmapSuiA/14pkn2EujoOIJ0JLH nGFlM/FQkfeTZit86C23OWMhtBm7A+2O2DY5bemUXwDi2XDpbhhbgQ4+tsGU/ydfyOIT aMhbin/s2qvxDtJY+w69AlyEZrfA3sHtKqplIwrXtc7BwY/4oXW39X3el/git+rFySA0 9QC/CJK4CO39NZfil7jGlVFBXYegjCIC/UDF9Cv25Lu/baZrrlv1o18K6E+DhWHM6WAy qGuA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:dkim-signature; bh=23qV2663zWwr/CStMGT7umB+EL3EJtABRxz6jrcrszs=; b=eudR9xEAFE3dc+y8ci5PYV5E/QiVxSC0a8N2+6fxNs9c0qvhlU7M3pz9ba9Kybw2dR y4g5KzxDImS96vl/xcKGRovA52Fv7/hYkXzvVZxH22APkrIl1Ckb7vIiYMVl5lrsMLpP 740ob5ra42xkuB2eGdAIem2a58jcnNEOhUIWltbo1a0LRGg8x3H8RQu6Fd1J7FecerqX X+aqsybkSsaNAZlNr80uT0lmXPRzxbBN4+wjcxAeYsLFTBRmqj20Kqzr/IvqEQG1WMhK HhqcH2TyCR1W9Plfs7oTKSJk/CASUO283S3pcVCVvdn7MtBCY4tD+zqqFToSkHyibX4O YqsA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=u+2cCEeG; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id j6si7408173edv.294.2021.06.17.20.05.23; Thu, 17 Jun 2021 20:05:45 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=u+2cCEeG; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233104AbhFRAJO (ORCPT + 99 others); Thu, 17 Jun 2021 20:09:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:33098 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229848AbhFRAJN (ORCPT ); Thu, 17 Jun 2021 20:09:13 -0400 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.