From patchwork Thu Nov 19 14:41:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11917647 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=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 8F691C64E8A for ; Thu, 19 Nov 2020 14:42:39 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 1E1FD24724 for ; Thu, 19 Nov 2020 14:42:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="CIIgMEJ/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1E1FD24724 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2C1FA6E59F; Thu, 19 Nov 2020 14:42:38 +0000 (UTC) Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by gabe.freedesktop.org (Postfix) with ESMTPS id 381206E55C for ; Thu, 19 Nov 2020 14:42:11 +0000 (UTC) Received: by mail-wr1-x444.google.com with SMTP id b6so6716748wrt.4 for ; Thu, 19 Nov 2020 06:42:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=lUo9ncFU/nKq3MG4mWQrX8BX1Csq/yukMRd1xs72MQA=; b=CIIgMEJ/YZCJYqrr/Qtw//Z/EuYS19MxKYSZBAuaNm2O4riC4ia7lWBoP9fdOxE899 lfrakfIMVKfanEOJTQM/T9AeH3p6C/ndGvDvgquoWvteonENyQO4m2trca3rvVUBYdrV pqSf5p+4Iw5KW2ru9wTswKE3C26aax9R920gc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=lUo9ncFU/nKq3MG4mWQrX8BX1Csq/yukMRd1xs72MQA=; b=gdDk6rod62mrLkxmy/+/Cc7TZq2KUtCbnBja0/4OIEwJqjl+AMfFhyqq1STt3/mlkP LlIaU5D/S1t5eF5I+7xtfLiVyR0zqd+D1rUQGWJ8d6mqldbNy5ZM7c7cqF1SvjV31ZA6 7/MgNNDdVSHaJt9OSltJb56mjGtHAKcxJKaLIvSxCQQESUiZrUDEIFuRQa0QHXHfEBI/ BvF+GVfU4PlSmWWc8ksVHKfZbwORJpuEvUuGA+5KpVfx+XsFfBWOn0c+tFg2CjdIc/KM ZVKI3hORTcylmfIOqqZypaE3+xSz1tf56VzIejQRQ6BibrEfua/PK0a1aA3an7Pj5cor dM8g== X-Gm-Message-State: AOAM5315gcLkhUkmU/+bUDEJjDRTB3+0yq9dtvaSgGygivj8w0HXQpgM d/ac+jkEQoaK7SfPat1HqK+LStBl0vNNhw== X-Google-Smtp-Source: ABdhPJwk5Y7yKnIhKFhsy0JLp99xQ3IuhlAonQX0yhhkN3nOXvFaqvGXi/lZAmUY0jINVS3Y2iOPTg== X-Received: by 2002:adf:f7c7:: with SMTP id a7mr11488760wrq.347.1605796929676; Thu, 19 Nov 2020 06:42:09 -0800 (PST) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id x63sm51292wmb.48.2020.11.19.06.42.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Nov 2020 06:42:08 -0800 (PST) From: Daniel Vetter To: DRI Development , LKML Subject: [PATCH v6 12/17] /dev/mem: Only set filp->f_mapping Date: Thu, 19 Nov 2020 15:41:41 +0100 Message-Id: <20201119144146.1045202-13-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201119144146.1045202-1-daniel.vetter@ffwll.ch> References: <20201119144146.1045202-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc@vger.kernel.org, Jan Kara , Kees Cook , kvm@vger.kernel.org, Jason Gunthorpe , Daniel Vetter , linux-mm@kvack.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , John Hubbard , Daniel Vetter , Dan Williams , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" When we care about pagecache maintenance, we need to make sure that both f_mapping and i_mapping point at the right mapping. But for iomem mappings we only care about the virtual/pte side of things, so f_mapping is enough. Also setting inode->i_mapping was confusing me as a driver maintainer, since in e.g. drivers/gpu we don't do that. Per Dan this seems to be copypasta from places which do care about pagecache consistency, but not needed. Hence remove it for slightly less confusion. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Reviewed-by: Dan Williams Signed-off-by: Daniel Vetter --- drivers/char/mem.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 94c2b556cf97..7dcf9e4ea79d 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -891,7 +891,6 @@ static int open_port(struct inode *inode, struct file *filp) * revocations when drivers want to take over a /dev/mem mapped * range. */ - inode->i_mapping = devmem_inode->i_mapping; filp->f_mapping = inode->i_mapping; return 0;