linux-kernel - Re: [PATCH 1/2][RFC v6] timekeeping: Ignore the bogus sleep time if pm

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Date:   Tue, 8 Nov 2016 20:50:06 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     x86@...nel.org
Cc:     Pavel Machek <pavel@....cz>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-pm@...r.kernel.org,
        rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Xunlei Pang <xlpang@...hat.com>
Subject: Re: [PATCH 1/2][RFC v6] timekeeping: Ignore the bogus sleep time if
 pm_trace is enabled

On Tue, Nov 08, 2016 at 05:01:35PM +0800, Chen Yu wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> 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 to bypass the bogus rtc interval when pm_trace is enabled.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Len Brown <lenb@...nel.org>
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Xunlei Pang <xlpang@...hat.com>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> ---
>
[cut]
Will resend another version. Thanks.