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-rw-r--r--arch/powerpc/mm/book3s64/pgtable.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 16bda049187a..ff98b663c83e 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -116,6 +116,9 @@ pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
/*
* This ensures that generic code that rely on IRQ disabling
* to prevent a parallel THP split work as expected.
+ *
+ * Marking the entry with _PAGE_INVALID && ~_PAGE_PRESENT requires
+ * a special case check in pmd_access_permitted.
*/
serialize_against_pte_lookup(vma->vm_mm);
return __pmd(old_pmd);