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