diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2014-01-15 16:33:20 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-01-16 09:27:15 +0100 |
| commit | 39fd8fd22b3224ec6819d33b3e34ae4da6a35f05 (patch) | |
| tree | 89d90224b682be4aa979465d52d06263b179a98f | |
| parent | e3de300d1212b42aa9d0d6031b12fca06ac00dd9 (diff) | |
sched: Fix up scheduler syscall LTP fails
Wu reported LTP failures:
> ltp.sched_setparam02.1.TFAIL
> ltp.sched_setparam02.2.TFAIL
> ltp.sched_setparam02.3.TFAIL
> ltp.sched_setparam03.1.TFAIL
There were 2 things wrong; firstly __setscheduler() failed on
sched_setparam()'s policy = -1, fix that by reading from p->policy in
that case.
Secondly, getparam() (and getattr()) would still report !0
sched_priority for !FIFO/RR tasks after having been such. So
unconditionally set p->rt_priority.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@gmail.com>
Cc: Dario Faggioli <raistlin@linux.it>
Fixes: d50dde5a10f3 ("sched: Add new scheduler syscalls to support an extended scheduling parameters ABI")
Link: http://lkml.kernel.org/r/20140115153320.GH31570@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/sched/core.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c1b3d7e04f0f..e9212eb354b8 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3172,15 +3172,23 @@ static void __setscheduler(struct rq *rq, struct task_struct *p, { int policy = attr->sched_policy; + if (policy == -1) /* setparam */ + policy = p->policy; + p->policy = policy; if (dl_policy(policy)) __setparam_dl(p, attr); - else if (rt_policy(policy)) - p->rt_priority = attr->sched_priority; - else + else if (fair_policy(policy)) p->static_prio = NICE_TO_PRIO(attr->sched_nice); + /* + * __sched_setscheduler() ensures attr->sched_priority == 0 when + * !rt_policy. Always setting this ensures that things like + * getparam()/getattr() don't report silly values for !rt tasks. + */ + p->rt_priority = attr->sched_priority; + p->normal_prio = normal_prio(p); p->prio = rt_mutex_getprio(p); |