Merge branch 'sched/smp' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-5.12/block-ipi

* 'sched/smp' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  smp: Process pending softirqs in flush_smp_call_function_from_idle()

Author: axboe

kernel/smp.c

@@ -14,6 +14,7 @@
 #include <linux/export.h>
 #include <linux/percpu.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 #include <linux/gfp.h>
 #include <linux/smp.h>
 #include <linux/cpu.h>
@@ -449,6 +450,9 @@ void flush_smp_call_function_from_idle(void)
 
 	local_irq_save(flags);
 	flush_smp_call_function_queue(true);
+	if (local_softirq_pending())
+		do_softirq();
+
 	local_irq_restore(flags);
 }