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Commit ac0101d3 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 37d0892c

arch/x86/kernel/pci-dma.c

+8 −1
Original line number Diff line number Diff line
@@ -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);