This patch is incomplete and thanks for Peter Zijlstra to point out

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

kernel/smp.c

@@ -136,7 +136,8 @@ __generic_smp_call_function_interrupt(int cpu, int run_callbacks)
 		if (!cpumask_test_and_clear_cpu(cpu, data->cpumask))
 			continue;
 
-		data->csd.func(data->csd.info);
+		if (run_callbacks)
+			data->csd.func(data->csd.info);
 
 		refs = atomic_dec_return(&data->refs);
 		WARN_ON(refs < 0);
@@ -187,7 +188,8 @@ __generic_smp_call_function_single_interrupt(int cpu, int run_callbacks)
 		 */
 		data_flags = data->flags;
 
-		data->func(data->info);
+		if (run_callbacks)
+			data->func(data->info);
 
 		/*
 		 * Unlocked CSDs are valid through generic_exec_single():