linux-kernel - Re: [PATCH 2/4] mm: cma: Contiguous Memory Allocator added

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Message-ID: <20100722150532.GA16119@rakim.wolfsonmicro.main>
Date:	Thu, 22 Jul 2010 16:05:32 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Michał Nazarewicz <m.nazarewicz@...sung.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	'Daniel Walker' <dwalker@...eaurora.org>, linux-mm@...ck.org,
	Pawel Osciak <p.osciak@...sung.com>,
	'Xiaolin Zhang' <xiaolin.zhang@...el.com>,
	'Hiremath Vaibhav' <hvaibhav@...com>,
	'Robert Fekete' <robert.fekete@...ricsson.com>,
	'Marcus Lorentzon' <marcus.xm.lorentzon@...ricsson.com>,
	linux-kernel@...r.kernel.org,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/4] mm: cma: Contiguous Memory Allocator added

On Thu, Jul 22, 2010 at 04:58:43PM +0200, Michał Nazarewicz wrote:
> On Thu, 22 Jul 2010 15:40:56 +0200, Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:

> >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.

> If there's any other easy way of overwriting platform's default I'm happy
> to listen. :)

Netlink or similar, for example?

> >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.

> Not sure what you mean here.  vmalloc() allocated buffers cannot be used
> with CMA since they are not contiguous in memory.

Sorry, thinko - I just meant allocated at runtime.  It'd fail a a lot of
the time so might not be worth bothering.
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