linux-kernel - Re: Can Linux live without DMA zone?

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Message-ID: <m364dwju0q.fsf@defiant.localdomain>
Date:	Fri, 03 Nov 2006 18:54:13 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Phillip Susi <psusi@....rr.com>, Jun Sun <jsun@...sun.net>,
	linux-kernel@...r.kernel.org
Subject: Re: Can Linux live without DMA zone?

Arjan van de Ven <arjan@...radead.org> writes:

> you're right in theory, but the kernel only has a few pools of memory
> available, but not at every bit boundary. there is a 32 bit pool
> (GFP_DMA32) on some, a 30-ish bit pool (GFP_KERNEL) on others, and a 24
> bit pool (GFP_DMA) with basically nothing inbetween.

Perhaps naive question, but... what's wrong with allocating memory
from the top (within given address mask[1], size-wise)? I think we
don't allocate more than 1 page with kmalloc anymore, do we?

[1] - some devices (a specific StrongARM only?) need non-continuous
masks due to a hardware bug(s).
-- 
Krzysztof Halasa
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