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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-27 13:30:02 +0100 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2015-08-13 16:06:43 +0200 |
| commit | 707917cbc6ac0c0ea968b5eb635722ea84808286 (patch) | |
| tree | 918113654c8ff1ad3e5796d46ed1f9974e3c96bd /drivers/iommu/tegra-smmu.c | |
| parent | 05a65f06f69fa6c487c2933f2971d9ec4e33eb0d (diff) | |
| download | linux-707917cbc6ac0c0ea968b5eb635722ea84808286.tar.gz | |
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: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/iommu/tegra-smmu.c')
| -rw-r--r-- | drivers/iommu/tegra-smmu.c | 18 |
1 files changed, 2 insertions, 16 deletions
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index eb9f6068fe2e..27d31f62a822 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -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)) { |