From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with ESMTP id 5E2C86B024D for ; Thu, 22 Jul 2010 09:41:13 -0400 (EDT) Date: Thu, 22 Jul 2010 14:40:56 +0100 From: Mark Brown Subject: Re: [PATCH 2/4] mm: cma: Contiguous Memory Allocator added Message-ID: <20100722134056.GJ4737@rakim.wolfsonmicro.main> References: <20100721135229.GC10930@sirena.org.uk> <20100721182457.GE10930@sirena.org.uk> <20100722090602.GF10930@sirena.org.uk> <000901cb297f$e28f2b10$a7ad8130$%szyprowski@samsung.com> <20100722105203.GD4737@rakim.wolfsonmicro.main> <20100722124559.GH4737@rakim.wolfsonmicro.main> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: owner-linux-mm@kvack.org To: =?utf-8?Q?Micha=C5=82?= Nazarewicz Cc: Marek Szyprowski , 'Daniel Walker' , linux-mm@kvack.org, Pawel Osciak , 'Xiaolin Zhang' , 'Hiremath Vaibhav' , 'Robert Fekete' , 'Marcus Lorentzon' , linux-kernel@vger.kernel.org, 'Kyungmin Park' , linux-arm-msm@vger.kernel.org List-ID: On Thu, Jul 22, 2010 at 03:24:26PM +0200, MichaA? Nazarewicz wrote: > That's why command line is only intended as a way to overwrite the > defaults which are provided by the platform. In a final product, > configuration should be specified in platform code and not on > command line. Yeah, agreed though I'm not convinced we can't do it via userspace (initrd would give us a chance to do stuff early) or just kernel rebuilds. > >It sounds like apart from the way you're passing the configuration in > >you're doing roughly what I'd suggest. I'd expect that in a lot of > >cases the map could be satisfied from the default region so there'd be > >no need to explicitly set one up. > Platform can specify something like: > cma_defaults("reg=20M", "*/*=reg"); > which would make all the drivers share 20 MiB region by default. I'm also > thinking if something like: Yes, exactly - probably you can even have a default region backed by normal vmalloc() RAM which would at least be able to take a stab at working by default. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org