diff options
| author | Andi Kleen | 2005-11-05 17:25:53 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2005-11-14 19:55:14 -0800 |
| commit | 47492d3667ec519172ab978bd8231b8c7152fa9d (patch) | |
| tree | 06e86f5fe27976d75a935458b1f428af410a04fe /arch | |
| parent | 07808b74e7dab1aa385e698795875337d72daf7d (diff) | |
[PATCH] x86_64: Use the DMA32 zone for dma_alloc_coherent()/pci_alloc_consistent
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86_64/kernel/pci-gart.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c index 88be97c96987..2e28e855ec3c 100644 --- a/arch/x86_64/kernel/pci-gart.c +++ b/arch/x86_64/kernel/pci-gart.c @@ -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; |