Re: DMA memory, split_page, BUG_ON(PageCompound()), sound

[Nick Piggin <nickpiggin@yahoo.com.au>]

Russell King wrote:
> On Mon, Jul 10, 2006 at 04:59:48PM +1000, Nick Piggin wrote:
>
> > I guess you could do it a number of ways. Maybe having GFP_USERMAP
> > set __GFP_USERMAP|__GFP_COMP, and the arm dma memory allocator can
> > strip the __GFP_COMP.
> >
> > If you get an explicit __GFP_COMP passed down, the allocator doesn't
> > know whether that was because they want a user mappable area, or
> > really want a compound page (in which case, stripping __GFP_COMP is
> > the wrong thing to do).
>
>
> So I'll mask off __GFP_COMP for the time being in the ARM dma allocator
> with a note to this effect?

I believe that should do the trick, yes (AFAIK, nobody yet is
explicitly relying on a compound page from the dma allocator).

Marc can hopefully confim the fix.

--
SUSE Labs, Novell Inc.
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