Re: [PATCH v0.9.1 3/6] sched/umcg: implement UMCG syscalls

On Sat, Nov 27, 2021 at 01:45:20AM +0100, Thomas Gleixner wrote:

On Fri, Nov 26 2021 at 22:59, Peter Zijlstra wrote:

quoted

On Fri, Nov 26, 2021 at 10:08:14PM +0100, Thomas Gleixner wrote:

quoted

quoted

+		if (timo)
+			hrtimer_sleeper_start_expires(&timeout, HRTIMER_MODE_ABS);
+
+		freezable_schedule();

You can replace the whole hrtimer foo with

                if (!schedule_hrtimeout_range_clock(timo ? &timo : NULL,
                                                    tsk->timer_slack_ns,
                                                    HRTIMER_MODE_ABS,
                                                    tsk->umcg_clock)) {
                	ret = -ETIMEOUT;
                        break;
                }

That seems to loose the freezable crud.. then again, since we're
interruptible, that shouldn't matter. Lemme go do that.

We could add a freezable wrapper for that if necessary.

I should just finish rewriting that freezer crap and then we can delete
it all :-) But I don't think that's needed in this case, as long as
we're interruptible we'll pass through the signal path which has a
try_to_freezer() in it.