Messages in this thread Patch in this message | | | From | FUJITA Tomonori <> | Subject | [PATCH 1/2] x86: avoid unnecessary low zone allocation in Calgary's alloc_coherent | Date | Thu, 11 Sep 2008 23:08:47 +0900 |
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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> Cc: Alexis Bruemmer <alexisb@us.ibm.com> Cc: Muli Ben-Yehuda <muli@il.ibm.com> --- arch/x86/kernel/pci-calgary_64.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c index 8415d92..fe7695e 100644 --- a/arch/x86/kernel/pci-calgary_64.c +++ b/arch/x86/kernel/pci-calgary_64.c @@ -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) -- 1.5.4.2
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