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Commit 707917cb authored by Russell King's avatar Russell King Committed by Thierry Reding
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iommu/tegra-smmu: Use __GFP_ZERO to allocate zeroed pages 



Rather than explicitly zeroing pages allocated via alloc_page(), add
__GFP_ZERO to the gfp mask to ask the allocator for zeroed pages.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 05a65f06

drivers/iommu/tegra-smmu.c

+2 −16
Original line number Diff line number Diff line
@@ -258,8 +258,6 @@ static bool tegra_smmu_capable(enum iommu_cap cap) 
static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)

{

	struct tegra_smmu_as *as;

	unsigned int i;

	uint32_t *pd;



	if (type != IOMMU_DOMAIN_UNMANAGED)

		return NULL;
@@ -270,7 +268,7 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type) 


	as->attr = SMMU_PD_READABLE | SMMU_PD_WRITABLE | SMMU_PD_NONSECURE;



	as->pd = alloc_page(GFP_KERNEL | __GFP_DMA);

	as->pd = alloc_page(GFP_KERNEL | __GFP_DMA | __GFP_ZERO);

	if (!as->pd) {

		kfree(as);

		return NULL;
@@ -291,12 +289,6 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type) 
		return NULL;

	}



	/* clear PDEs */

	pd = page_address(as->pd);



	for (i = 0; i < SMMU_NUM_PDE; i++)

		pd[i] = 0;



	/* setup aperture */

	as->domain.geometry.aperture_start = 0;

	as->domain.geometry.aperture_end = 0xffffffff;
@@ -533,21 +525,15 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova, 
	u32 *pd = page_address(as->pd), *pt;

	unsigned int pde = iova_pd_index(iova);

	struct tegra_smmu *smmu = as->smmu;

	unsigned int i;



	if (!as->pts[pde]) {

		struct page *page;

		dma_addr_t dma;



		page = alloc_page(GFP_KERNEL | __GFP_DMA);

		page = alloc_page(GFP_KERNEL | __GFP_DMA | __GFP_ZERO);

		if (!page)

			return NULL;



		pt = page_address(page);



		for (i = 0; i < SMMU_NUM_PTE; i++)

			pt[i] = 0;



		dma = dma_map_page(smmu->dev, page, 0, SMMU_SIZE_PT,

				   DMA_TO_DEVICE);

		if (dma_mapping_error(smmu->dev, dma)) {