Merge v6.12.35linux-rolling-lts

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index 9edbd871c31b..5f12cdc2b967 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -330,13 +330,14 @@ static inline void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *b
 }
 
 /*
- * If mprotect/munmap/etc occurs during TLB batched flushing, we need to
- * synchronise all the TLBI issued with a DSB to avoid the race mentioned in
- * flush_tlb_batched_pending().
+ * If mprotect/munmap/etc occurs during TLB batched flushing, we need to ensure
+ * all the previously issued TLBIs targeting mm have completed. But since we
+ * can be executing on a remote CPU, a DSB cannot guarantee this like it can
+ * for arch_tlbbatch_flush(). Our only option is to flush the entire mm.
  */
 static inline void arch_flush_tlb_batched_pending(struct mm_struct *mm)
 {
-	dsb(ish);
+	flush_tlb_mm(mm);
 }
 
 /*