linux-kernel - Re: [tip:x86/timers] sched/clock: Enable sched clock early

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Date:   Mon, 30 Jul 2018 09:44:41 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     peterz@...radead.org
Cc:     Guenter Roeck <linux@...ck-us.net>,
        LKML <linux-kernel@...r.kernel.org>, mingo@...nel.org,
        tglx@...utronix.de, hpa@...or.com,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/timers] sched/clock: Enable sched clock early

> > -       if (cd.actual_read_sched_clock == jiffy_sched_clock_read)
> > +       if (cd.actual_read_sched_clock == jiffy_sched_clock_read) {
> > +               local_irq_disable();
> >                 sched_clock_register(jiffy_sched_clock_read, BITS_PER_LONG, HZ);
> > +               local_irq_enable();
> > +       }
> >
> >         update_sched_clock();
>
> I'm thinking maybe disable IRQs for that entire function, instead of
> just the register call.

Sure, I will send a patch.

Thank you,
Pavel