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=-6.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 84301C2B9F4 for ; Fri, 18 Jun 2021 00:08:54 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 432DE6100B for ; Fri, 18 Jun 2021 00:08:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 432DE6100B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=vOQE7NVlsvIEixaybKkAIZlsGyFEgErbsZACN22Ics4=; b=ri4xlB+dVAMFCXTA7NjSlQ/IYl PeJoE/M+WF2b3yoaBdD978hoIgfeM8cAgNprtiXFq0bgtwYm2DCJtwz2dIIJkJutfhUZGUmJMFbvs mG0I7EcSUX1D0rhmfGKn52/hkZqpewN8VY3yQhccTjn6ULuGhT4AAMGOSoTmwnYWDjRTGQnMWxTJ1 xbwpHR30wc6ODVg6dgi4aZIH87RRWQ94R9H0yAyqxRAAasFlJbpgMsjUe/VqBF3ttrZNRZSuozstZ 0jSM44wOB9RnfdWsdQThsFfh5UXgnEYRJDc0Qt3Dl7NMl2aNgWSUgD1Kfxk+adpRs5fch4r/GPHvo fDvAhlwQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lu22O-00C9op-CS; Fri, 18 Jun 2021 00:07:08 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lu22L-00C9o4-HD for linux-arm-kernel@lists.infradead.org; Fri, 18 Jun 2021 00:07:06 +0000 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-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210617_170705_641691_5D11FBB1 X-CRM114-Status: UNSURE ( 8.99 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel