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x86: avoid unnecessary low zone allocation in Calgary's alloc_coherent

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x86's common alloc_coherent (dma_alloc_coherent in dma-mapping.h) sets
up the gfp flag according to the device dma_mask but Calgary doesn't
need it because of virtual mappings. This patch avoids unnecessary low
zone allocation.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori 2008-09-11 23:08:47 +09:00 committed by Ingo Molnar
parent bee44f294e
commit f10ac8a232
1 changed files with 2 additions and 0 deletions
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arch/x86/kernel/pci-calgary_64.c
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@ -491,6 +491,8 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size,
npages = size >> PAGE_SHIFT;
order = get_order(size);
flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
/* alloc enough pages (and possibly more) */
ret = (void *)__get_free_pages(flag, order);
if (!ret)