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=-2.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 4833DC31E4C for ; Fri, 14 Jun 2019 13:47:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 134D720866 for ; Fri, 14 Jun 2019 13:47:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Cj3+LM9v" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728636AbfFNNrp (ORCPT ); Fri, 14 Jun 2019 09:47:45 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:50618 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728583AbfFNNro (ORCPT ); Fri, 14 Jun 2019 09:47:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=2klM0787YOypidTxFFKkFXrGCXrbMhQ5qreI3X9Vu1k=; b=Cj3+LM9vIrA6nltYCay8yBPba y6IkbYwpLx9JZh8kK5t2kLy0T8EhKYFLd4ni8FEoVyGRGa1u1i3grWUes4UAS9IJ9k3PGBxh0Ddkp +eH6rF5lBzxCwQMwke6G/c2TJda2p6rGBomPUsGZBfRc0dQxUxHgwIel6XPax0+lxmSXe9hnoqneL tM4WnvDTXZk0YQhKyEzCwXVDmrezpr/WzX/aQS4stZilw7GkSoqCXo2Zka98OqbC6gFV5/7OKNZNF BKEvRnmiaTr9rp4o4Y6qOWysCXUmGZc3uHBgRcuKZdrN51a9q9TVTZ/wz3VsIWst8b5uTNKZ6nDin VS2+DYitQ==; Received: from 213-225-9-13.nat.highway.a1.net ([213.225.9.13] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hbmYG-0004Xc-Jk; Fri, 14 Jun 2019 13:47:33 +0000 From: Christoph Hellwig To: Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Daniel Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Ian Abbott , H Hartley Sweeten Cc: Intel Linux Wireless , linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT), dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-s390@vger.kernel.org, devel@driverdev.osuosl.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: use exact allocation for dma coherent memory Date: Fri, 14 Jun 2019 15:47:10 +0200 Message-Id: <20190614134726.3827-1-hch@lst.de> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi all, various architectures have used exact memory allocations for dma allocations for a long time, but x86 and thus the common code based on it kept using our normal power of two allocator, which tends to waste a lot of memory for certain allocations. Switching to a slightly cleaned up alloc_pages_exact is pretty easy, but it turns out that because we didn't filter valid gfp_t flags on the DMA allocator, a bunch of drivers were passing __GFP_COMP to it, which is rather bogus in too many ways to explain. Arm has been filtering it for a while, but this series instead tries to fix the drivers and warn when __GFP_COMP is passed, which makes it much larger than just adding the functionality.