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Commit 77308e27 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Tony Luck
Browse files

ia64: remove the dead iommu_sac_force variable 



Looks like copy and paste from x86 that never actually got used.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent b501fb92

arch/ia64/kernel/pci-dma.c

+0 −19
Original line number Diff line number Diff line
@@ -18,8 +18,6 @@ 
dma_addr_t bad_dma_address __read_mostly;

EXPORT_SYMBOL(bad_dma_address);



static int iommu_sac_force __read_mostly;



int no_iommu __read_mostly;

#ifdef CONFIG_IOMMU_DEBUG

int force_iommu __read_mostly = 1;
@@ -61,23 +59,6 @@ int iommu_dma_supported(struct device *dev, u64 mask) 
	if (mask < DMA_BIT_MASK(24))

		return 0;



	/* Tell the device to use SAC when IOMMU force is on.  This

	   allows the driver to use cheaper accesses in some cases.



	   Problem with this is that if we overflow the IOMMU area and

	   return DAC as fallback address the device may not handle it

	   correctly.



	   As a special case some controllers have a 39bit address

	   mode that is as efficient as 32bit (aic79xx). Don't force

	   SAC for these.  Assume all masks <= 40 bits are of this

	   type. Normally this doesn't make any difference, but gives

	   more gentle handling of IOMMU overflow. */

	if (iommu_sac_force && (mask >= DMA_BIT_MASK(40))) {

		dev_info(dev, "Force SAC with mask %llx\n", mask);

		return 0;

	}



	return 1;

}

EXPORT_SYMBOL(iommu_dma_supported);