Re: [PATCH 2/6] Introduce CONFIG_ZONE_DMA
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- To: Paul Mundt <lethal@xxxxxxxxxxxx>
- Subject: Re: [PATCH 2/6] Introduce CONFIG_ZONE_DMA
- From: Christoph Lameter <clameter@xxxxxxx>
- Date: Mon, 18 Sep 2006 10:33:00 -0700 (PDT)
- Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, Nick Piggin <nickpiggin@xxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, Marcelo Tosatti <marcelo@xxxxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxx>, Martin Bligh <mbligh@xxxxxxxxxx>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxx>, linux-arch@xxxxxxxxxxxxxxx
- In-reply-to: <20060918152243.GA4320@xxxxxxxxxxxxxxxx>
- References: <20060911222729.4849.69497.sendpatchset@xxxxxxxxxxxxxxxxxxxxxxxxx> <20060911222739.4849.79915.sendpatchset@xxxxxxxxxxxxxxxxxxxxxxxxx> <20060918135559.GB15096@xxxxxxxxxxxxx> <20060918152243.GA4320@xxxxxxxxxxxxxxxx>
On Tue, 19 Sep 2006, Paul Mundt wrote:
> sh and sh64 have no use for ZONE_DMA, it's effectively ZONE_DMA ==
> ZONE_NORMAL anyways, so it can be safely switched off (though
> arch/sh/mm/init.c should then be changed to use ZONE_NORMAL if ZONE_DMA
> goes away, as we currently place all lowmem in ZONE_DMA, likewise for
> sh64). None of our DMA controllers have any particular limitations where
> ZONE_DMA would be useful at least.
Ok. I dropped the CONFIG_ZONE_DMA for sh so you will no longer have a DMA
zone when this patch goes in.
sh64 has the same strange code as parisc:
config GENERIC_ISA_DMA
bool
You do not have ISA_DMA so I should drop these lines?
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