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[195.135.220.15]) by mx.google.com with ESMTPS id u8si6776559ejr.211.2019.05.22.14.00.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 May 2019 14:00:56 -0700 (PDT) Received-SPF: pass (google.com: domain of oneukum@suse.com designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of oneukum@suse.com designates 195.135.220.15 as permitted sender) smtp.mailfrom=oneukum@suse.com X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id E4870AD78; Wed, 22 May 2019 21:00:55 +0000 (UTC) Message-ID: <1558558075.2470.2.camel@suse.com> Subject: Re: [RFC PATCH] usb: host: xhci: allow __GFP_FS in dma allocation From: Oliver Neukum To: Alan Stern Cc: Jaewon Kim , Christoph Hellwig , linux-mm@kvack.org, gregkh@linuxfoundation.org, Jaewon Kim , m.szyprowski@samsung.com, ytk.lee@samsung.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Date: Wed, 22 May 2019 22:47:55 +0200 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mi, 2019-05-22 at 10:56 -0400, Alan Stern wrote: > On Wed, 22 May 2019, Oliver Neukum wrote: > > > I agree with the problem, but I fail to see why this issue would be > > specific to USB. Shouldn't this be done in the device core layer? > > Only for drivers that are on the block-device writeback path. The > device core doesn't know which drivers these are. Neither does USB know. It is very hard to predict or even tell which devices are block device drivers. I think we must assume that any device may be affected. Regards Oliver