Commit 4ff9083b authored Sep 07, 2017 by Peter Zijlstra Committed by Ingo Molnar Sep 12, 2017

sched/core: WARN() when migrating to an offline CPU



Migrating tasks to offline CPUs is a pretty big fail, warn about it.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170907150614.094206976@infradead.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent edd8e41d

kernel/sched/core.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1173,6 +1173,10 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
		WARN_ON_ONCE(debug_locks && !(lockdep_is_held(&p->pi_lock) \|\|
		lockdep_is_held(&task_rq(p)->lock)));
		#endif
		/*
		* Clearly, migrating tasks to offline CPUs is a fairly daft thing.
		*/
		WARN_ON_ONCE(!cpu_online(new_cpu));
		#endif

		trace_sched_migrate_task(p, new_cpu);