iommu/tegra-smmu: Remove PageReserved manipulation

Remove the unnecessary manipulation of the PageReserved flags in the
Tegra SMMU driver.  None of this is required as the page(s) remain
private to the SMMU driver.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/iommu/tegra-smmu.c

@@ -293,7 +293,6 @@ static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
 
 	/* clear PDEs */
 	pd = page_address(as->pd);
-	SetPageReserved(as->pd);
 
 	for (i = 0; i < SMMU_NUM_PDE; i++)
 		pd[i] = 0;
@@ -311,7 +310,6 @@ static void tegra_smmu_domain_free(struct iommu_domain *domain)
 	struct tegra_smmu_as *as = to_smmu_as(domain);
 
 	/* TODO: free page directory and page tables */
-	ClearPageReserved(as->pd);
 
 	kfree(as);
 }
@@ -566,8 +564,6 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova,
 
 		as->pts[pde] = page;
 
-		SetPageReserved(page);
-
 		pd[pde] = SMMU_MK_PDE(dma, SMMU_PDE_ATTR | SMMU_PDE_NEXT);
 
 		dma_sync_single_range_for_device(smmu->dev, as->pd_dma,
@@ -617,7 +613,6 @@ static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova)
 
 		/* Finally, free the page */
 		dma_unmap_page(smmu->dev, pte_dma, SMMU_SIZE_PT, DMA_TO_DEVICE);
-		ClearPageReserved(page);
 		__free_page(page);
 		as->pts[pde] = NULL;
 	}