linux-kernel - Re: [PATCH][RFC v7] timekeeping: Ignore the bogus sleep time if pm

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Date:   Thu, 10 Nov 2016 10:26:09 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Chen Yu <yu.c.chen@...el.com>
Cc:     Linux PM list <linux-pm@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Xunlei Pang <xlpang@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, Len Brown <lenb@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH][RFC v7] timekeeping: Ignore the bogus sleep time if
 pm_trace is enabled

On Wed, Nov 9, 2016 at 8:55 PM, Chen Yu <yu.c.chen@...el.com> wrote:
> Previously we encountered some memory overflow issues due to
> the bogus sleep time brought by inconsistent rtc, which is
> triggered when pm_trace is enabled, and we have fixed it
> in recent kernel. However it's improper in the first place
> to call __timekeeping_inject_sleeptime() in case that pm_trace
> is enabled simply because that "hash" time value will wreckage
> the timekeeping subsystem.
>
> This patch is originally written by Thomas, which would bypass
> the bogus rtc interval when pm_trace is enabled.
> Meanwhile, if system succeed to resume back with pm_trace set, the
> users are warned to adjust the bogus rtc either by ntp-date or rdate,
> by resetting pm_trace_rtc_abused to false, otherwise above tools might
> not work as expected.
>
> Originally-from: Thomas Gleixner <tglx@...utronix.de>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Xunlei Pang <xlpang@...hat.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Len Brown <lenb@...nel.org>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>


Looks ok to me. I'm queueing it up for testing.  If no one objects
(and I don't see any issues) I'll merge it to my tree and push it to
-tip through Thomas.

thanks
-john