mips: merge the identical "return from syscall" per-ABI code

No need to keep 4 copies of that stuff; merged and taken to
entry.S, unused public symbols there killed off.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/mips/kernel/entry.S

@@ -77,7 +77,7 @@ FEXPORT(syscall_exit)
 	and	t0, a2, t0
 	bnez	t0, syscall_exit_work
 
-FEXPORT(restore_all)			# restore full frame
+restore_all:				# restore full frame
 #ifdef CONFIG_MIPS_MT_SMTC
 #ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
 /* Re-arm any temporarily masked interrupts not explicitly "acked" */
@@ -117,7 +117,7 @@ FEXPORT(restore_all)			# restore full frame
 	RESTORE_TEMP
 	RESTORE_AT
 	RESTORE_STATIC
-FEXPORT(restore_partial)		# restore partial frame
+restore_partial:		# restore partial frame
 #ifdef CONFIG_TRACE_IRQFLAGS
 	SAVE_STATIC
 	SAVE_AT
@@ -164,7 +164,13 @@ work_notifysig:				# deal with pending signals and
 	jal	do_notify_resume	# a2 already loaded
 	j	resume_userspace
 
-FEXPORT(syscall_exit_work_partial)
+FEXPORT(syscall_exit_partial)
+	local_irq_disable		# make sure need_resched doesn't
+					# change between and return
+	LONG_L	a2, TI_FLAGS($28)	# current->work
+	li	t0, _TIF_ALLWORK_MASK
+	and	t0, a2
+	beqz	t0, restore_partial
 	SAVE_STATIC
 syscall_exit_work:
 	LONG_L	t0, PT_STATUS(sp)		# returning to kernel mode?

arch/mips/kernel/scall32-o32.S

@@ -69,18 +69,7 @@ stack_done:
 1:	sw	v0, PT_R2(sp)		# result
 
 o32_syscall_exit:
-	local_irq_disable		# make sure need_resched and
-					# signals dont change between
-					# sampling and return
-	lw	a2, TI_FLAGS($28)	# current->work
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2
-	bnez	t0, o32_syscall_exit_work
-
-	j	restore_partial
-
-o32_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */
 

arch/mips/kernel/scall64-64.S

@@ -72,18 +72,7 @@ NESTED(handle_sys64, PT_SIZE, sp)
 1:	sd	v0, PT_R2(sp)		# result
 
 n64_syscall_exit:
-	local_irq_disable		# make sure need_resched and
-					# signals dont change between
-					# sampling and return
-	LONG_L	a2, TI_FLAGS($28)	# current->work
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2, t0
-	bnez	t0, n64_syscall_exit_work
-
-	j	restore_partial
-
-n64_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */
 

arch/mips/kernel/scall64-n32.S

@@ -70,18 +70,7 @@ NESTED(handle_sysn32, PT_SIZE, sp)
 	sd	t1, PT_R0(sp)		# save it for syscall restarting
 1:	sd	v0, PT_R2(sp)		# result
 
-	local_irq_disable		# make sure need_resched and
-					# signals dont change between
-					# sampling and return
-	LONG_L  a2, TI_FLAGS($28)	# current->work
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2, t0
-	bnez	t0, n32_syscall_exit_work
-
-	j	restore_partial
-
-n32_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */
 

arch/mips/kernel/scall64-o32.S

@@ -99,18 +99,7 @@ NESTED(handle_sys, PT_SIZE, sp)
 1:	sd	v0, PT_R2(sp)		# result
 
 o32_syscall_exit:
-	local_irq_disable		# make need_resched and
-					# signals dont change between
-					# sampling and return
-	LONG_L	a2, TI_FLAGS($28)
-	li	t0, _TIF_ALLWORK_MASK
-	and	t0, a2, t0
-	bnez	t0, o32_syscall_exit_work
-
-	j	restore_partial
-
-o32_syscall_exit_work:
-	j	syscall_exit_work_partial
+	j	syscall_exit_partial
 
 /* ------------------------------------------------------------------------ */