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| author | Peter Zijlstra <peterz@infradead.org> | 2014-01-27 11:54:13 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-01-28 13:08:41 +0100 |
| commit | a57beec5d427086cdc8d75fd51164577193fa7f4 (patch) | |
| tree | 86bbff9570824031ec4bd42bfd5dd11e4b825a55 /kernel/sched | |
| parent | 712e5e34aef449ab680b35c0d9016f59b0a4494c (diff) | |
| download | linux-a57beec5d427086cdc8d75fd51164577193fa7f4.tar.gz linux-a57beec5d427086cdc8d75fd51164577193fa7f4.tar.bz2 linux-a57beec5d427086cdc8d75fd51164577193fa7f4.zip | |
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/sched')
| -rw-r--r-- | kernel/sched/core.c | 4 |
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(); |