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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 DCEB1C432C0 for ; Thu, 28 Nov 2019 15:54:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF0172178F for ; Thu, 28 Nov 2019 15:54:33 +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="NHjInXez" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726558AbfK1Pyd (ORCPT ); Thu, 28 Nov 2019 10:54:33 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:33608 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726510AbfK1Pyc (ORCPT ); Thu, 28 Nov 2019 10:54:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=M7wa2eYP8n8bEo5wUF/1ZUe+1l62DJk2bgC8MhhDcWk=; b=NHjInXez6NpLI5NrOhBl6GRca d5U9QaifWR9l6XE8K3jP15QhlLjODuTN/P0YTkB/00QikEBv5xNvfckbM4Q9AJO5ElbfuYofi6R6Q X1TK7FRKJrkoVx0a4MTdS5rVVROpwH2uEjz4NalPjazU5UynV8y1wVn18yh7YztdwA7tUJTnRQvuw cKxXBF7L1qQdGrYXhQnVKqc9ENF7lf2vbCwgzzg7xQN45HiP4YngQkY48D2kF1j7RH85zqT/3TBPS 7e4Vyd7Gr5fWKa3Mp2HdlcrcHdEWknua68ZmedZkNzafuTMygvdXZteMhO4py08gNrT+yvYVacTQm hqvrBbr+Q==; Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1iaM7e-0000I6-6c; Thu, 28 Nov 2019 15:54:26 +0000 Date: Thu, 28 Nov 2019 07:54:26 -0800 From: Christoph Hellwig To: "Martin K. Petersen" Cc: Christoph Hellwig , Hannes Reinecke , Arnd Bergmann , "(Exiting) Baolin Wang" , Baolin Wang , Adrian Hunter , Ulf Hansson , asutoshd@codeaurora.org, Orson Zhai , Lyra Zhang , Linus Walleij , Vincent Guittot , linux-mmc , "linux-kernel@vger.kernel.org" , Hannes Reinecke , linux-block , Paolo Valente Subject: Re: [PATCH v6 0/4] Add MMC software queue support Message-ID: <20191128155426.GA31042@infradead.org> References: <20191127090023.GA23040@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Thu, Nov 28, 2019 at 07:15:09AM -0500, Martin K. Petersen wrote: > This mirrors single_lun in SCSI closely. I was hoping we could > eventually get rid of that travesty but if MMC needs something similar, > maybe it would be good to move that plumbing to block? Oh, I totally forgot about single_lun. Given that it is only set for ancient CD changers I'm not even sure that code works properly anymore. Having common code that is exercised regularly by mmc would certainly be better than the current SCSI code, but I'm not sure how well this is going to work out.