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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 47514C433E0 for ; Tue, 4 Aug 2020 06:06:44 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 2E5D32076E for ; Tue, 4 Aug 2020 06:06:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E5D32076E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 03DC884763; Tue, 4 Aug 2020 06:06:43 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pV5MGpHZMm2F; Tue, 4 Aug 2020 06:06:40 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id EBBDE84798; Tue, 4 Aug 2020 06:06:40 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id D4A99C0050; Tue, 4 Aug 2020 06:06:40 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 4A93FC004C for ; Tue, 4 Aug 2020 06:06:39 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 2E42585E93 for ; Tue, 4 Aug 2020 06:06:39 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jsAAGT29uFK2 for ; Tue, 4 Aug 2020 06:06:37 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by hemlock.osuosl.org (Postfix) with ESMTPS id C246B85DB5 for ; Tue, 4 Aug 2020 06:06:37 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 852C86736F; Tue, 4 Aug 2020 08:06:33 +0200 (CEST) Date: Tue, 4 Aug 2020 08:06:33 +0200 From: Christoph Hellwig To: Nicolas Saenz Julienne Subject: Re: [PATCH v2 2/2] dma-pool: Only allocate from CMA when in same memory zone Message-ID: <20200804060633.GA7368@lst.de> References: <20200803160956.19235-1-nsaenzjulienne@suse.de> <20200803160956.19235-3-nsaenzjulienne@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200803160956.19235-3-nsaenzjulienne@suse.de> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: amit.pundir@linaro.org, linux-kernel@vger.kernel.org, jeremy.linton@arm.com, iommu@lists.linux-foundation.org, linux-rpi-kernel@lists.infradead.org, rientjes@google.com, Robin Murphy , hch@lst.de X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Mon, Aug 03, 2020 at 06:09:56PM +0200, Nicolas Saenz Julienne wrote: > + if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA)) > + return end <= DMA_BIT_MASK(zone_dma_bits); > + if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32)) > + return end <= DMA_BIT_MASK(32); > + if (gfp & GFP_KERNEL) > + return end > DMA_BIT_MASK(32); So the GFP_KERNEL one here looks weird. For one I don't think the if line is needed at all, and it just confuses things. Second I don't see the need (and actually some harm) in preventing GFP_KERNEL allocations from dipping into lower CMA areas - something that we did support before 5.8 with the single pool. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu