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-rw-r--r--mm/huge_memory.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 86eafd91c982..1764184c4774 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3023,8 +3023,10 @@ void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
return;
/*
- * Caller holds the mmap_sem write mode, so a huge pmd cannot
- * materialize from under us.
+ * Caller holds the mmap_sem write mode or the anon_vma lock,
+ * so a huge pmd cannot materialize from under us (khugepaged
+ * holds both the mmap_sem write mode and the anon_vma lock
+ * write mode).
*/
__split_huge_pmd(vma, pmd, address, freeze);
}