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authorPeter Zijlstra <peterz@infradead.org>2014-01-27 11:54:13 +0100
committerIngo Molnar <mingo@kernel.org>2014-01-28 13:08:41 +0100
commita57beec5d427086cdc8d75fd51164577193fa7f4 (patch)
tree86bbff9570824031ec4bd42bfd5dd11e4b825a55 /kernel
parent712e5e34aef449ab680b35c0d9016f59b0a4494c (diff)
downloadlinux-a57beec5d427086cdc8d75fd51164577193fa7f4.tar.bz2
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: Tommi Rantala <tt.rantala@gmail.com> Cc: Dave Jones <davej@redhat.com> Cc: Tommi Rantala <tt.rantala@gmail.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20140127105413.GC11314@laptop.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 36c951b7eef8..81343d6bd9cb 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4324,7 +4324,9 @@ SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
goto out_unlock;
rq = task_rq_lock(p, &flags);
- time_slice = p->sched_class->get_rr_interval(rq, p);
+ 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);
rcu_read_unlock();