Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Revert "x86-64: Avoid unnecessary double bouncing for swiotlb"
Commit id 6142891a0c0209c91aa4a98f725de0d6e2ed4918
Andi Kleen reports that it seems to break things for some people,
and since it's purely a small optimization, revert it for now.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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include/asm-x86_64/pci.h
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include/asm-x86_64/pci.h
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* address space. The networking and block device layers use
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* this boolean for bounce buffer decisions
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*
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* On x86-64 it mostly equals, but we set it to zero to tell some subsystems
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* that an hard or soft IOMMU is available.
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* On AMD64 it mostly equals, but we set it to zero to tell some subsystems
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* that an IOMMU is available.
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*/
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-
#define PCI_DMA_BUS_IS_PHYS 0
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#define PCI_DMA_BUS_IS_PHYS (no_iommu ? 1 : 0)
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/*
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* x86-64 always supports DAC, but sometimes it is useful to force