From patchwork Fri Nov 27 16:41:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11936883 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 4E1A8C8302D for ; Fri, 27 Nov 2020 16:43:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 154BA206D8 for ; Fri, 27 Nov 2020 16:43:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="U7CnpbD0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732069AbgK0Qmq (ORCPT ); Fri, 27 Nov 2020 11:42:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731807AbgK0QmM (ORCPT ); Fri, 27 Nov 2020 11:42:12 -0500 Received: from mail-wm1-x343.google.com (mail-wm1-x343.google.com [IPv6:2a00:1450:4864:20::343]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C8AD5C061A51 for ; Fri, 27 Nov 2020 08:42:10 -0800 (PST) Received: by mail-wm1-x343.google.com with SMTP id c198so5650581wmd.0 for ; Fri, 27 Nov 2020 08:42:10 -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=U7CnpbD00qEoN/vUsVW+I4243+W/JnXoGNjkeopzZQU5so09mhertht0Ptz/Y9CU97 QBJjqG6J8HVGWhflVJAnSEhJA51fquUA/rLUSiFGQ3D16s3hdHYPSCDYykR5ivgrpzt5 UNuqMwTHX4nMkYA9iGIVY8KW3+QGNck+OCdBk= 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=oNfZzeJlSxNBd4o3oBDZAuGdRxiIIgNRcDkX4ruqSzYEqa666LPLBGl8fI4ySBaOW0 lY0xuJMXfSOEJbilBFUmSjm6hI9mMzsDHfdnkuK9Io7zck56yPB6CyM5DjCI8WcceLoZ R8RJmeQB9sg0pWDI9wWnC3db71AWioxcQWZtvpaLG7379z4RE5Iz7kCL2tnkKhmBl9C+ VchUzskeYqQvD48oiUu0LAk9vV7qppQxNEr9XDdVq2AYb/ZosHuSampdorD+Z9LoFP+E EK/HOvvXYebJMXuDONF4s9v7qvuvXoWfe2QshjhMb/3lH/xLjxzWSq0HQDGnl6DKaiaB 34IA== X-Gm-Message-State: AOAM5323lPk8Jh6hEOqHU8w37fr87McSwDa1Vt2jNBFM0Zq0YLEimNZn PD77GQynMub2crzxBOM0jZameg== X-Google-Smtp-Source: ABdhPJxKU2LEPA3ycZu0g6uNTdSP1FwFa6HvSU/jo43OGE9w8xBQTe6/Vk/r7mX9FCsKkcy0le5iyg== X-Received: by 2002:a7b:cbd1:: with SMTP id n17mr9963982wmi.186.1606495329592; Fri, 27 Nov 2020 08:42:09 -0800 (PST) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q12sm14859078wrx.86.2020.11.27.08.42.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Nov 2020 08:42:08 -0800 (PST) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara Subject: [PATCH v7 09/17] /dev/mem: Only set filp->f_mapping Date: Fri, 27 Nov 2020 17:41:23 +0100 Message-Id: <20201127164131.2244124-10-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201127164131.2244124-1-daniel.vetter@ffwll.ch> References: <20201127164131.2244124-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org 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;