sched: Fix up scheduler syscall LTP fails
authorPeter Zijlstra <peterz@infradead.org>
Wed, 15 Jan 2014 15:33:20 +0000 (16:33 +0100)
committerIngo Molnar <mingo@kernel.org>
Thu, 16 Jan 2014 08:27:15 +0000 (09:27 +0100)
commit39fd8fd22b3224ec6819d33b3e34ae4da6a35f05
tree89d90224b682be4aa979465d52d06263b179a98f
parente3de300d1212b42aa9d0d6031b12fca06ac00dd9
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>
kernel/sched/core.c