linux-kernel - Re: [PATCH] introduce config option to disable DMA zone on i386

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Message-id: <45942599.7040409@shaw.ca>
Date:	Thu, 28 Dec 2006 14:14:17 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Marcelo Tosatti <marcelo@...ck.org>
Subject: Re: [PATCH] introduce config option to disable DMA zone on i386

Arjan van de Ven wrote:
> ...but Marcelo's patch doesn't implement anything of that kind....
> In addition, many ISA bus drivers do not use the DMA API *at all*
> currently. If you want to fix them all up, great! But somehow I doubt
> those will get fixed in the next decade.. they've been like this for at
> least half a decade or longer :-)

Point being, if this doesn't already work it's likely a bug even without 
this patch. And drivers that don't use the DMA API should at least be 
allocating memory with GFP_DMA which should fail if that zone doesn't 
contain any memory (and if not, that's likely a bug as well).

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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