[POWERPC] Fix sparse warnings in arch/powerpc/mm

Make two vmemmap helpers static in init_64.c
Make stab variables static in stab.c
Make psize defs static in hash_utils_64.c

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index c5ac532..1e52e97 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -183,7 +183,7 @@
  * do this by hand as the proffered address may not be correctly aligned.
  * Subtraction of non-aligned pointers produces undefined results.
  */
-unsigned long __meminit vmemmap_section_start(unsigned long page)
+static unsigned long __meminit vmemmap_section_start(unsigned long page)
 {
 	unsigned long offset = page - ((unsigned long)(vmemmap));
 
@@ -196,7 +196,7 @@
  * which overlaps this vmemmap page is initialised then this page is
  * initialised already.
  */
-int __meminit vmemmap_populated(unsigned long start, int page_size)
+static int __meminit vmemmap_populated(unsigned long start, int page_size)
 {
 	unsigned long end = start + page_size;