mips: move build_tlb_refill_handler() prototype

Instead of having a declaration for each caller, have one that is shared
with the function definition, which avoids a warning:

arch/mips/mm/tlbex.c:2547:6: error: no previous prototype for 'build_tlb_refill_handler' [-Werror=missing-prototypes]

Link: https://lkml.kernel.org/r/20231204115710.2247097-8-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/include/asm/tlbex.h

@@ -23,6 +23,7 @@ void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep);
 void build_tlb_write_entry(u32 **p, struct uasm_label **l,
 			   struct uasm_reloc **r,
 			   enum tlb_write_entry wmode);
+void build_tlb_refill_handler(void);
 
 extern void handle_tlbl(void);
 extern char handle_tlbl_end[];

arch/mips/mm/tlb-r3k.c

@@ -23,11 +23,10 @@
 #include <asm/io.h>
 #include <asm/bootinfo.h>
 #include <asm/cpu.h>
+#include <asm/tlbex.h>
 
 #undef DEBUG_TLB
 
-extern void build_tlb_refill_handler(void);
-
 /* CP0 hazard avoidance. */
 #define BARRIER				\
 	__asm__ __volatile__(		\

arch/mips/mm/tlb-r4k.c

@@ -22,10 +22,9 @@
 #include <asm/hazards.h>
 #include <asm/mmu_context.h>
 #include <asm/tlb.h>
+#include <asm/tlbex.h>
 #include <asm/tlbmisc.h>
 
-extern void build_tlb_refill_handler(void);
-
 /*
  * LOONGSON-2 has a 4 entry itlb which is a subset of jtlb, LOONGSON-3 has
  * a 4 entry itlb and a 4 entry dtlb which are subsets of jtlb. Unfortunately,