Messages in this thread | | | Date | Mon, 30 Sep 2002 13:33:01 -0700 (PDT) | Subject | Re: [PATCH] ALSA update [6/10] - 2002/07/20 | From | "David S. Miller" <> |
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From: Alan Cox <alan@lxorguk.ukuu.org.uk> Date: 30 Sep 2002 13:54:11 +0100
On Mon, 2002-09-30 at 01:53, David S. Miller wrote: > EISA/ISA DMA is defined as using a hwdev of NULL or requiring > <16MB address, he is preserving GFP_DMA in those cases. Firstly the DMA mask on x86 can't be below 24bits, we don't support allocation from a smaller zone.
Understood.
Secondly what about PCI for 25-31bits - there we do need to force gfp_dma to have any chance of getting the right pages Look at what his code does after the GFP_DMA setting, it goes a non-GFP_DMA setting, and if the 25-31 bits case is not satisfied it backs down to GFP_DMA.
Giving the page allocator a mask argument does sound a lot nicer It's pretty simple to implement too since we do have page_to_phys. - 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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