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 <stable@xxxxxxxxxxxxxxx> know about it.
>From ce5f7f8200ca2504f6f290044393d73ca314965a Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Mon, 12 May 2014 22:50:34 +0200
Subject: sched/deadline: Change sched_getparam() behaviour vs SCHED_DEADLINE
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
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.
Requested-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Acked-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: Dario Faggioli <raistlin@xxxxxxxx>
Cc: linux-man <linux-man@xxxxxxxxxxxxxxx>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20140512205034.GH13467@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/core.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -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 peterz@xxxxxxxxxxxxx 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
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