diff --git a/arch/powerpc/mm/pageattr.c b/arch/powerpc/mm/pageattr.c
index 85753e32a4de..6163e484bc6d 100644
--- a/arch/powerpc/mm/pageattr.c
+++ b/arch/powerpc/mm/pageattr.c
@@ -31,6 +31,7 @@ static int change_page_attr(pte_t *ptep, unsigned long addr, void *data)
 {
 	long action = (long)data;
 
+	addr &= PAGE_MASK;
 	/* modify the PTE bits as desired */
 	switch (action) {
 	case SET_MEMORY_RO: