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Commit ce5f7f82 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched/deadline: Change sched_getparam() behaviour vs SCHED_DEADLINE 



The way we read POSIX one should only call sched_getparam() when
sched_getscheduler() returns either SCHED_FIFO or SCHED_RR.

Given that we currently return sched_param::sched_priority=0 for all
others, extend the same behaviour to SCHED_DEADLINE.

Requested-by: default avatarMichael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Acked-by: default avatarMichael Kerrisk <mtk.manpages@gmail.com>
Cc: Dario Faggioli <raistlin@linux.it>
Cc: linux-man <linux-man@vger.kernel.org>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: Juri Lelli <juri.lelli@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20140512205034.GH13467@laptop.programming.kicks-ass.net


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent dbdb2275

kernel/sched/core.c

+3 −6
Original line number Diff line number Diff line
@@ -3713,7 +3713,7 @@ SYSCALL_DEFINE1(sched_getscheduler, pid_t, pid) 
 */

SYSCALL_DEFINE2(sched_getparam, pid_t, pid, struct sched_param __user *, param)

{

	struct sched_param lp;

	struct sched_param lp = { .sched_priority = 0 };

	struct task_struct *p;

	int retval;
@@ -3730,10 +3730,7 @@ SYSCALL_DEFINE2(sched_getparam, pid_t, pid, struct sched_param __user *, param) 
	if (retval)

		goto out_unlock;



	if (task_has_dl_policy(p)) {

		retval = -EINVAL;

		goto out_unlock;

	}

	if (task_has_rt_policy(p))

		lp.sched_priority = p->rt_priority;

	rcu_read_unlock();