[SPARC]: Remove schedule_tail ifdefs.

arch/sparc/kernel/entry.S

@@ -1475,11 +1475,8 @@ linux_syscall_trace:
 
 	.globl	C_LABEL(ret_from_fork)
 C_LABEL(ret_from_fork):
-#if CONFIG_SMP || CONFIG_PREEMPT
-/* XXX Wrong location: call schedule_tail in every ret_sys_call. */
 	call	schedule_tail
 	 mov	%g3, %o0
-#endif
 	b	C_LABEL(ret_sys_call)
 	 ld	[%sp + REGWIN_SZ + PT_I0], %o0
 

arch/sparc64/kernel/entry.S

@@ -1619,10 +1619,8 @@ ret_from_syscall:
 		 */
 		andn		%o7, _TIF_NEWCHILD, %l0
 		stx		%l0, [%g6 + TI_FLAGS]
-#if CONFIG_SMP || CONFIG_PREEMPT
 		call		schedule_tail
 		 mov		%g5, %o0
-#endif
 		andcc		%l0, _TIF_PERFCTR, %g0
 		be,pt		%icc, 1f
 		 nop