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SubjectRe: [ANNOUNCE] 3.6.9-rt21
On Sat, 15 Dec 2012, Mike Galbraith wrote:
> On Wed, 2012-12-05 at 17:05 +0100, Thomas Gleixner wrote:
> > Dear RT Folks,
> >
> > I'm pleased to announce the 3.6.9-rt21 release. 3.6.7-rt18, 3.6.8-rt19
> > and 3.6.9-rt20 are not announced updates to the respective 3.6.y
> > stable releases without any RT changes
> >
> > Changes since 3.6.9-rt20:
> >
> > * Fix the PREEMPT_LAZY implementation on ARM
> >
> > * Fix the RCUTINY issues
> >
> > * Fix a long standing scheduler bug (See commit log of
> > sched-enqueue-to-head.patch)
>
> That last has an oversight buglet.
>
> sched: add missing userspace->kernel struct sched_param.sched_priority inversion
>
> Signed-off-by: Mike Galbraith <bitbucket@online.de>
> ---
> kernel/sched/core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4624,7 +4624,7 @@ static int __sched_setscheduler(struct t
> p->sched_reset_on_fork = reset_on_fork;
>
> oldprio = p->prio;
> - if (oldprio == param->sched_priority)
> + if (oldprio == (MAX_RT_PRIO - 1) - param->sched_priority)
> goto out;
>
> on_rq = p->on_rq;

Duh, yes. But there is another one here:

+ enqueue_task(rq, p, oldprio < param->sched_priority ?
+ ENQUEUE_HEAD : 0);

Bah. This reverse user/kernel priority nonsense really should go away!

Thanks,

tglx


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