[MIPS] Add external declaration of pagetable_init() to pgalloc.h

This fixes some sparse warnings.

pgtable-32.c:15:6: warning: symbol 'pgd_init' was not declared. Should it be static?
pgtable-32.c:32:13: warning: symbol 'pagetable_init' was not declared. Should it be static?
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mm/init.c

@@ -314,8 +314,6 @@ void __init fixrange_init(unsigned long start, unsigned long end,
 }
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
-extern void pagetable_init(void);
-
 static int __init page_is_ram(unsigned long pagenr)
 {
 	int i;

arch/mips/mm/pgtable-32.c

@@ -11,6 +11,7 @@
 #include <linux/highmem.h>
 #include <asm/fixmap.h>
 #include <asm/pgtable.h>
+#include <asm/pgalloc.h>
 
 void pgd_init(unsigned long page)
 {

arch/mips/mm/pgtable-64.c

@@ -10,6 +10,7 @@
 #include <linux/mm.h>
 #include <asm/fixmap.h>
 #include <asm/pgtable.h>
+#include <asm/pgalloc.h>
 
 void pgd_init(unsigned long page)
 {

arch/mips/sgi-ip27/ip27-memory.c

@@ -21,6 +21,7 @@
 #include <linux/pfn.h>
 #include <linux/highmem.h>
 #include <asm/page.h>
+#include <asm/pgalloc.h>
 #include <asm/sections.h>
 
 #include <asm/sn/arch.h>
@@ -503,7 +504,6 @@ void __init prom_free_prom_memory(void)
 	/* We got nothing to free here ...  */
 }
 
-extern void pagetable_init(void);
 extern unsigned long setup_zero_pages(void);
 
 void __init paging_init(void)

include/asm-mips/pgalloc.h

@@ -130,4 +130,6 @@ static inline void pmd_free(pmd_t *pmd)
 
 #define check_pgt_cache()	do { } while (0)
 
+extern void pagetable_init(void);
+
 #endif /* _ASM_PGALLOC_H */