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[RFC,04/11] arm64: tlb: Justify non-leaf invalidation in flush_tlb_range()

Message ID 1535125966-7666-5-git-send-email-will.deacon@arm.com
State Superseded
Headers show
Series Avoid synchronous TLB invalidation for intermediate page-table entries on arm64 | expand

Commit Message

Will Deacon Aug. 24, 2018, 3:52 p.m. UTC 
Add a comment to explain why we can't get away with last-level
invalidation in flush_tlb_range()

Signed-off-by: Will Deacon <will.deacon@arm.com>

---
 arch/arm64/include/asm/tlbflush.h | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.1.4
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Patch

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index e257f8655b84..ddbf1718669d 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -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);
 }