linux-kernel - Re: [PATCH v12 11/11] x86/tsc: use tsc early

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Message-ID: <alpine.DEB.2.21.1806231850430.8650@nanos.tec.linutronix.de>
Date:   Sat, 23 Jun 2018 18:56:59 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
cc:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        linux@...linux.org.uk, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, john.stultz@...aro.org,
        sboyd@...eaurora.org, x86@...nel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, hpa@...or.com, douly.fnst@...fujitsu.com,
        peterz@...radead.org, prarit@...hat.com, feng.tang@...el.com,
        pmladek@...e.com, gnomes@...rguk.ukuu.org.uk,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH v12 11/11] x86/tsc: use tsc early

On Thu, 21 Jun 2018, Pavel Tatashin wrote:
>  /*
>   * Scheduler clock - returns current time in nanosec units.
>   */
> @@ -1354,6 +1364,7 @@ void __init tsc_early_delay_calibrate(void)
>  	lpj = tsc_khz * 1000;
>  	do_div(lpj, HZ);
>  	loops_per_jiffy = lpj;
> +	sched_clock_early_init(tsc_khz);
>  }
>  
>  void __init tsc_init(void)
> @@ -1382,6 +1393,7 @@ void __init tsc_init(void)
>  	if (!tsc_khz) {
>  		mark_tsc_unstable("could not calculate TSC khz");
>  		setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
> +		static_branch_disable(&__use_tsc);

This wants a proper comment.

>  		return;
>  	}

Thanks,

	tglx