ARM: LPAE: Invalidate the TLB before freeing the PMD (c9f27f10) · Commits · 戴 / test

Similar to the PTE freeing, this patch introduced __pmd_free_tlb() which invalidates the TLB before freeing a PMD page. This is needed because on newer processors the entry in the upper page table may be cached by the TLB and point to random data after the PMD has been freed. Signed-off-by:

Catalin Marinas <catalin.marinas@arm.com>

arch/arm/include/asm/tlb.h

+10 −1

Original line number	Diff line number	Diff line
		@@ -202,8 +202,17 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
		tlb_remove_page(tlb, pte);
		}

		static inline void __pmd_free_tlb(struct mmu_gather tlb, pmd_t pmdp,
		unsigned long addr)
		{
		#ifdef CONFIG_ARM_LPAE
		tlb_add_flush(tlb, addr);
		tlb_remove_page(tlb, virt_to_page(pmdp));
		#endif
		}

		#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
		#define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp)
		#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
		#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)

		#define tlb_migrate_finish(mm) do { } while (0)

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