powerpc/mm: Fix a WARN_ON() with CONFIG_DEBUG_PAGEALLOC and CONFIG_DEBUG_VM

Set need to call __set_pte_at() and not set_pte_at() from __change_page_attr()
since the later will perform checks with CONFIG_DEBUG_VM that aren't suitable
to the way we override an existing PTE. (More specifically, it doesn't let
you write over a present PTE).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 177e4038b43c..573b3bd1c45b 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -382,7 +382,7 @@ static int __change_page_attr(struct page *page, pgprot_t prot)
                 return 0;
         if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
                 return -EINVAL;
-        set_pte_at(&init_mm, address, kpte, mk_pte(page, prot));
+        __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
         wmb();
 #ifdef CONFIG_PPC_STD_MMU
         flush_hash_pages(0, address, pmd_val(*kpmd), 1);