keep track of IRQ context and don't do thread migration there

kernel/include/cls.h

@@ -67,6 +67,7 @@ struct cpu_local_var {
 
 	ihk_spinlock_t migq_lock;
 	struct list_head migq;
+	int in_interrupt;
 } __attribute__((aligned(64)));
 
 

kernel/process.c

@@ -2293,7 +2293,7 @@ redo:
 		ihk_mc_spinlock_unlock(&(v->runq_lock), irqstate);
 	}
 
-	if (v->flags & CPU_FLAG_NEED_MIGRATE) {
+	if (v->flags & CPU_FLAG_NEED_MIGRATE && !v->in_interrupt) {
 		v->flags &= ~CPU_FLAG_NEED_MIGRATE;
 		do_migrate();
 		goto redo;