Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751425AbWCBJwD (ORCPT ); Thu, 2 Mar 2006 04:52:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751978AbWCBJwD (ORCPT ); Thu, 2 Mar 2006 04:52:03 -0500 Received: from 85.8.13.51.se.wasadata.net ([85.8.13.51]:44165 "EHLO smtp.drzeus.cx") by vger.kernel.org with ESMTP id S1751425AbWCBJwA (ORCPT ); Thu, 2 Mar 2006 04:52:00 -0500 Message-ID: <4406C044.4080201@drzeus.cx> Date: Thu, 02 Mar 2006 10:52:04 +0100 From: Pierre Ossman User-Agent: Thunderbird 1.5 (X11/20060210) MIME-Version: 1.0 To: Pierre Ossman , Jens Axboe , LKML Subject: Re: How to map high memory for block io References: <43DA97A3.4080408@drzeus.cx> <20060127225428.GD2767@flint.arm.linux.org.uk> <20060128191759.GC9750@suse.de> <43DBC6E2.4000305@drzeus.cx> <20060129152228.GF13831@suse.de> <43DDC6F9.6070007@drzeus.cx> <20060130080930.GB4209@suse.de> <43DFAEC6.3090205@drzeus.cx> <20060301232913.GC4024@flint.arm.linux.org.uk> <44069E3A.4000907@drzeus.cx> <20060302094153.GA14017@flint.arm.linux.org.uk> In-Reply-To: <20060302094153.GA14017@flint.arm.linux.org.uk> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1105 Lines: 30 Russell King wrote: > On Thu, Mar 02, 2006 at 08:26:50AM +0100, Pierre Ossman wrote: > >> Russell King wrote: >> >>> Okay, I've hit this same problem (but in a slightly different way) with >>> mmci.c. The way I'm proposing to fix this for mmci is to introduce a >>> new capability which says "clustering is supported by this driver." >>> >> This will decrease performance more than necessary for drivers that can >> do clustering, just not in highmem. So what about another flag that says >> "highmem is supported by this driver"? >> > > I think you're asking Jens that question - I know of no way to tell > the block layer that clustering is fine for normal but not highmem. > > That wasn't what I meant. What I was referring to was disabling highmem altogether, the way that is done now through looking at the dma mask. Rgds Pierre - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/