linux-kernel - Re: [PATCH v3] power: Add warning message about incorrect system date and time after resume when pm

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Message-ID: <20130626231808.GB13166@amd.pavel.ucw.cz>
Date:	Thu, 27 Jun 2013 01:18:08 +0200
From:	Pavel Machek <pavel@....cz>
To:	Shuah Khan <shuah.kh@...sung.com>
Cc:	rjw@...k.pl, len.brown@...el.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, shuahkhan@...il.com
Subject: Re: [PATCH v3] power: Add warning message about incorrect system
 date and time after resume when pm_trace is enabled

On Wed 2013-06-26 16:27:35, Shuah Khan wrote:
> pm_trace uses the system's Real Time Clock (RTC) to save the magic number.
> Reason for this is that the RTC is the only reliably available piece of
> hardware during resume operations where a value can be set that will
> survive a reboot.
> 
> Consequence is that after a resume (even if it is successful) your system
> clock will have a value corresponding to the magic number instead of the
> correct date/time! It is therefore advisable to use a program like ntp-date
> or rdate to reset the correct date/time from an external time source when
> using this trace option.
> 
> There is no run-time message to warn users of the consequences of enabling
> pm_trace. Adding a warning message to pm_trace_store() will serve as a
> reminder to users to set the system date and time after resume.
> 
> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>

Acked-by: Pavel Machek <pavel@....cz>

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