mips: hide conditionally unused functions

A couple of functions are defined unconditionally but have a conditional
declaration:

arch/mips/mm/tlb-r4k.c:461:12: error: no previous prototype for 'add_temporary_entry' [-Werror=missing-prototypes]
arch/mips/mm/pgtable-64.c:92:7: error: no previous prototype for 'mk_pmd' [-Werror=missing-prototypes]
arch/mips/mm/pgtable-64.c:101:6: error: no previous prototype for 'set_pmd_at' [-Werror=missing-prototypes]

Since there are no callers in these configurations, add the same #ifdef
checks around the definitions.

Link: https://lkml.kernel.org/r/20231204115710.2247097-19-arnd@kernel.orgSigned-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Stephen Rothwell <sfr@rothwell.id.au>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/mips/mm/pgtable-64.c

@@ -89,6 +89,7 @@ void pud_init(void *addr)
 }
 #endif
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 pmd_t mk_pmd(struct page *page, pgprot_t prot)
 {
 	pmd_t pmd;
@@ -103,6 +104,7 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 {
 	*pmdp = pmd;
 }
+#endif
 
 void __init pagetable_init(void)
 {

arch/mips/mm/tlb-r4k.c

@@ -458,6 +458,7 @@ EXPORT_SYMBOL(has_transparent_hugepage);
 
 int temp_tlb_entry;
 
+#ifndef CONFIG_64BIT
 __init int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
 			       unsigned long entryhi, unsigned long pagemask)
 {
@@ -496,6 +497,7 @@ __init int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
 	local_irq_restore(flags);
 	return ret;
 }
+#endif
 
 static int ntlb;
 static int __init set_ntlb(char *str)