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Commit a57beec5 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: Make sched_class::get_rr_interval() optional 



Not all classes implement (or can implement) a useful get_rr_interval()
function, default to a 0 time-slice for them.

This fixes a crash reported by Tommi Rantala.

Reported-by: default avatarTommi Rantala <tt.rantala@gmail.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140127105413.GC11314@laptop.programming.kicks-ass.net


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 712e5e34

kernel/sched/core.c

+3 −1
Original line number Diff line number Diff line
@@ -4324,6 +4324,8 @@ SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid, 
		goto out_unlock;



	rq = task_rq_lock(p, &flags);

	time_slice = 0;

	if (p->sched_class->get_rr_interval)

		time_slice = p->sched_class->get_rr_interval(rq, p);

	task_rq_unlock(rq, p, &flags);