Patch "sched/deadline: Change sched_getparam() behaviour vs SCHED_DEADLINE" has been added to the 3.14-stable tree

This is a note to let you know that I've just added the patch titled

sched/deadline: Change sched_getparam() behaviour vs SCHED_DEADLINE

to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
sched-deadline-change-sched_getparam-behaviour-vs-sched_deadline.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Peter Zijlstra <[email protected]>
Date: Mon, 12 May 2014 22:50:34 +0200
Subject: sched/deadline: Change sched_getparam() behaviour vs SCHED_DEADLINE

From: Peter Zijlstra <[email protected]>

commit ce5f7f8200ca2504f6f290044393d73ca314965a upstream.

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.

---
 kernel/sched/core.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

@@ -3735,7 +3735,7 @@ SYSCALL_DEFINE1(sched_getscheduler, 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;
 

@@ -3752,11 +3752,8 @@ SYSCALL_DEFINE2(sched_getparam, pid_t, p
 	if (retval)
 		goto out_unlock;
 
-	if (task_has_dl_policy(p)) {
-		retval = -EINVAL;
-		goto out_unlock;
-	}
-	lp.sched_priority = p->rt_priority;
+	if (task_has_rt_policy(p))
+		lp.sched_priority = p->rt_priority;
 	rcu_read_unlock();
 
 	/*

Patches currently in stable-queue which might be from [email protected] are

queue-3.14/sched-deadline-fix-memory-leak.patch queue-3.14/sched-use-cpupri_nr_priorities-instead-of-max_rt_prio-in-cpupri-check.patch queue-3.14/perf-prevent-false-warning-in-perf_swevent_add.patch queue-3.14/sched-dl-fix-race-in-dl_task_timer.patch queue-3.14/perf-fix-race-in-removing-an-event.patch queue-3.14/sched-fix-hotplug-vs.-set_cpus_allowed_ptr.patch queue-3.14/sched-deadline-restrict-user-params-max-value-to-2-63-ns.patch queue-3.14/sched-make-sched_setattr-correctly-return-efbig.patch queue-3.14/perf-limit-perf_event_attr-sample_period-to-63-bits.patch queue-3.14/sched-disallow-sched_attr-sched_policy-0.patch queue-3.14/sched-deadline-change-sched_getparam-behaviour-vs-sched_deadline.patch queue-3.14/sched-sanitize-irq-accounting-madness.patch