Re: [PATCH] mm: don't use ZONE_DMA unless CONFIG_ZONE_DMA is setin setup.c

From: Andres Salomon
Date: Tue Mar 06 2007 - 23:42:56 EST


Dave Jones wrote:
> On Tue, Mar 06, 2007 at 05:52:46PM -0800, Andrew Morton wrote:
> > On Tue, 06 Mar 2007 18:52:59 -0500
> > Andres Salomon <dilinger@xxxxxxxxxx> wrote:
> >
> > > If CONFIG_ZONE_DMA is ever undefined, ZONE_DMA will also not be defined,
> > > and setup.c won't compile. This wraps it with an #ifdef.
> > >
> >
> > I guess if anyone tries to disable ZONE_DMA on i386 they'll pretty quickly
> > discover that. But I don't think we need to "fix" it yet?

Oh, it's certainly not urgent. I sent it simply for correctness reasons.

It would've been nice to see the ZONE_DMA removal patches just #define
ZONE_DMA regardless, and include less #ifdefs scattered about; but at
this point, I'd just as soon prefer to see a proper way to allocate
things based on address constraints (as discussed in
http://www.gelato.unsw.edu.au/archives/linux-ia64/0609/19036.html).


>
> CONFIG_ZONE_DMA isn't even optional on i386, so I'm curious how
> you could hit this compile failure.
>

Why, with custom code of course ;)

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