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authorPeter Zijlstra <peterz@infradead.org>2014-05-12 22:50:34 +0200
committerIngo Molnar <mingo@kernel.org>2014-05-22 10:21:26 +0200
commitce5f7f8200ca2504f6f290044393d73ca314965a (patch)
treec82c7cb66b268676f8da0e3801c5ce1240ce693c /kernel
parentsched: Disallow sched_attr::sched_policy < 0 (diff)
downloadlinux-dev-ce5f7f8200ca2504f6f290044393d73ca314965a.tar.xz
linux-dev-ce5f7f8200ca2504f6f290044393d73ca314965a.zip
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: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Michael 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: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index cdefcf7c5925..f3f08bf94355 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -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;
@@ -3730,11 +3730,8 @@ 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;
- }
- lp.sched_priority = p->rt_priority;
+ if (task_has_rt_policy(p))
+ lp.sched_priority = p->rt_priority;
rcu_read_unlock();
/*