smp, hexagon: kill SMP single function call interrupt

Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic
similar to smp_call_function_single()" has unified the way to handle
single and multiple cross-CPU function calls. Now only one intterupt
is needed for architecture specific code to support generic SMP function
call interfaces, so kill the redundant single function call interrupt.

Cc: Andrew Morton <[e-mail]>
Cc: Shaohua Li <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Steven Rostedt <[e-mail]>
Cc: Jiri Kosina <[e-mail]>
Cc: Richard Kuo <[e-mail]>
Cc: [e-mail]
Signed-off-by: Jiang Liu <[e-mail]>
Signed-off-by: Richard Kuo <[e-mail]>

arch/hexagon/include/asm/smp.h

···
 	IPI_NOP = 0,
 	IPI_RESCHEDULE = 1,
 	IPI_CALL_FUNC,
-	IPI_CALL_FUNC_SINGLE,
 	IPI_CPU_STOP,
 	IPI_TIMER,
 };

arch/hexagon/kernel/smp.c

···
 			generic_smp_call_function_interrupt();
 			break;
 
-		case IPI_CALL_FUNC_SINGLE:
-			generic_smp_call_function_single_interrupt();
-			break;
-
 		case IPI_CPU_STOP:
 			/*
 			 * call vmstop()
···
 
 void arch_send_call_function_single_ipi(int cpu)
 {
-	send_ipi(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
+	send_ipi(cpumask_of(cpu), IPI_CALL_FUNC);
 }
 
 void arch_send_call_function_ipi_mask(const struct cpumask *mask)