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iommu: exynos: tell kmemleak to ignore 2nd level page tables

PATCH Applied Dmitry Torokhov 2 participants 2 messages May 9, 2015 – May 11, 2015

Subsystems (3)
Arm Samsung Exynos IOMMU Exynos sysmmu (IOMMU) driver
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Dmitry Torokhov

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PATCH 1/1 iommu: exynos: tell kmemleak to ignore 2nd level page tables

From: Colin Cross <[email protected]>

The pointers to the 2nd level page tables are converted to 1st level page table entries, which means kmemleak can't find them and assumes they have been leaked. Call kmemleak_ignore on the 2nd level page tables to prevent them from showing up in kmemleak reports.

Signed-off-by Colin Cross <[email protected]>
Signed-off-by Dmitry Torokhov <[email protected]>
---
 drivers/iommu/exynos-iommu.c | 1 +
 1 file changed, 1 insertion(+)
drivers/iommu/exynos-iommu.c +1 -0
index dc14fec4..16920b2 100644
@@ -855,6 +855,7 @@ static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv,
 			return ERR_PTR(-ENOMEM);
 
 		*sent = mk_lv1ent_page(virt_to_phys(pent));
+		kmemleak_ignore(pent);
 		*pgcounter = NUM_LV2ENTRIES;
 		pgtable_flush(pent, pent + NUM_LV2ENTRIES);
 		pgtable_flush(sent, sent + 1);
Signature · 5 lines
2.2.0.rc0.207.ga3a616c


-- 
Dmitry
maintainer Applied
#1 lore raw
Quoted 7 lines · Dmitry Torokhov

From: Colin Cross <[email protected]>

The pointers to the 2nd level page tables are converted to 1st level page table entries, which means kmemleak can't find them and assumes they have been leaked. Call kmemleak_ignore on the 2nd level page tables to prevent them from showing up in kmemleak reports.

Quoted 5 lines
Signed-off-by Colin Cross <[email protected]>
Signed-off-by Dmitry Torokhov <[email protected]>
---
 drivers/iommu/exynos-iommu.c | 1 +
 1 file changed, 1 insertion(+)

Applied to arm/exynos, thanks.