Messages in this thread | | | Date | Wed, 12 Jul 2006 11:32:41 +0100 | From | Russell King <> | Subject | Re: DMA memory, split_page, BUG_ON(PageCompound()), sound |
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On Tue, Jul 11, 2006 at 03:34:11AM +1000, Nick Piggin wrote: > 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).
In which case should ALSA be passing __GFP_COMP to the dma allocator ?
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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