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[PATCH] x86_64: Use the DMA32 zone for dma_alloc_coherent()/pci_alloc_consistent

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Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-11-05 17:25:53 +01:00 committed by Linus Torvalds
parent 07808b74e7
commit 47492d3667
1 changed files with 7 additions and 1 deletions
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8
arch/x86_64/kernel/pci-gart.c
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@ -220,6 +220,12 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
uses the normal dma_mask for alloc_coherent. */
dma_mask &= *dev->dma_mask;
/* Why <=? Even when the mask is smaller than 4GB it is often larger
than 16MB and in this case we have a chance of finding fitting memory
in the next higher zone first. If not retry with true GFP_DMA. -AK */
if (dma_mask <= 0xffffffff)
gfp |= GFP_DMA32;
again:
memory = dma_alloc_pages(dev, gfp, get_order(size));
if (memory == NULL)
@ -245,7 +251,7 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
}
if (!(gfp & GFP_DMA)) {
gfp |= GFP_DMA;
gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
goto again;
}
return NULL;