powerpc: Make a bunch of things static

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index c695943a..c90e602 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -48,7 +48,7 @@
 	    (_PAGE_PRESENT | _PAGE_USER);
 }
 
-struct page * maybe_pte_to_page(pte_t pte)
+static struct page *maybe_pte_to_page(pte_t pte)
 {
 	unsigned long pfn = pte_pfn(pte);
 	struct page *page;