Commit d8289d3a authored by Will Deacon's avatar Will Deacon Committed by Catalin Marinas
Browse files

arm64: tlb: Justify non-leaf invalidation in flush_tlb_range() 



Add a comment to explain why we can't get away with last-level
invalidation in flush_tlb_range()

Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 0795edaf

arch/arm64/include/asm/tlbflush.h

+4 −0
Original line number Diff line number Diff line
@@ -182,6 +182,10 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma, 
static inline void flush_tlb_range(struct vm_area_struct *vma,

				   unsigned long start, unsigned long end)

{

	/*

	 * We cannot use leaf-only invalidation here, since we may be invalidating

	 * table entries as part of collapsing hugepages or moving page tables.

	 */

	__flush_tlb_range(vma, start, end, false);

}

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