Commit-ID: ac0101d396fee24994632f71b55b9f7f9ee16eff Gitweb: http://git.kernel.org/tip/ac0101d396fee24994632f71b55b9f7f9ee16eff Author: Joerg Roedel <joerg.roedel@xxxxxxx> AuthorDate: Tue, 1 Sep 2009 16:00:35 +0200 Committer: Joerg Roedel <joerg.roedel@xxxxxxx> CommitDate: Thu, 3 Sep 2009 16:13:46 +0200 x86/dma: Mark iommu_pass_through as __read_mostly This variable is read most of the time. This patch marks it as such. It also documents the meaning the this variable while at it. Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx> --- arch/x86/kernel/pci-dma.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 1a041bc..873aa07 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -32,7 +32,14 @@ int no_iommu __read_mostly; /* Set this to 1 if there is a HW IOMMU in the system */ int iommu_detected __read_mostly = 0; -int iommu_pass_through; +/* + * This variable becomes 1 if iommu=pt is passed on the kernel command line. + * If this variable is 1, IOMMU implementations do no DMA ranslation for + * devices and allow every device to access to whole physical memory. This is + * useful if a user want to use an IOMMU only for KVM device assignment to + * guests and not for driver dma translation. + */ +int iommu_pass_through __read_mostly; dma_addr_t bad_dma_address __read_mostly = 0; EXPORT_SYMBOL(bad_dma_address); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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