arch: add do_page_fault prototypes

do_page_fault() is missing a declaration on a couple of architectures:

arch/alpha/mm/fault.c:85:1: error: no previous prototype for 'do_page_fault' [-Werror=missing-prototypes]
arch/csky/mm/fault.c:187:17: error: no previous prototype for 'do_page_fault' [-Werror=missing-prototypes]
arch/mips/mm/fault.c:323:17: error: no previous prototype for 'do_page_fault' [-Werror=missing-prototypes]
arch/nios2/mm/fault.c:43:17: error: no previous prototype for 'do_page_fault' [-Werror=missing-prototypes]
arch/sh/mm/fault.c:389:27: error: no previous prototype for 'do_page_fault' [-Werror=missing-prototypes]

Since the calling conventions are architecture specific here,
add separate prototypes for each one.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/alpha/include/asm/mmu_context.h

@@ -183,6 +183,8 @@ ev4_switch_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm,
 }
 
 extern void __load_new_mm_context(struct mm_struct *);
+asmlinkage void do_page_fault(unsigned long address, unsigned long mmcsr,
+			      long cause, struct pt_regs *regs);
 
 #ifdef CONFIG_SMP
 #define check_mmu_context()					\

arch/csky/include/asm/traps.h

@@ -55,4 +55,6 @@ asmlinkage void trap_c(struct pt_regs *regs);
 asmlinkage void do_notify_resume(struct pt_regs *regs,
 			unsigned long thread_info_flags);
 
+asmlinkage void do_page_fault(struct pt_regs *regs);
+
 #endif /* __ASM_CSKY_TRAPS_H */

arch/mips/include/asm/traps.h

@@ -39,4 +39,7 @@ extern char except_vec_nmi[];
 	register_nmi_notifier(&fn##_nb);				\
 })
 
+asmlinkage void do_page_fault(struct pt_regs *regs,
+	unsigned long write, unsigned long address);
+
 #endif /* _ASM_TRAPS_H */

arch/nios2/include/asm/traps.h

@@ -14,6 +14,8 @@
 
 #ifndef __ASSEMBLY__
 void _exception(int signo, struct pt_regs *regs, int code, unsigned long addr);
+void do_page_fault(struct pt_regs *regs, unsigned long cause,
+		   unsigned long address);
 #endif
 
 #endif /* _ASM_NIOS2_TRAPS_H */

arch/sh/include/asm/traps_32.h

@@ -43,6 +43,9 @@ static inline void trigger_address_error(void)
 asmlinkage void do_address_error(struct pt_regs *regs,
 				 unsigned long writeaccess,
 				 unsigned long address);
+asmlinkage void do_page_fault(struct pt_regs *regs,
+			      unsigned long error_code,
+			      unsigned long address);
 asmlinkage void do_divide_error(unsigned long r4);
 asmlinkage void do_reserved_inst(void);
 asmlinkage void do_illegal_slot_inst(void);