linux-kernel - Re: [PATCH]drivers:base:power:trace.c Add "UTC" Coordinated Universal Time to the printk.

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Message-Id: <201106132347.08007.rjw@sisk.pl>
Date:	Mon, 13 Jun 2011 23:47:07 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH]drivers:base:power:trace.c Add "UTC" Coordinated Universal Time to the printk.

On Monday, June 13, 2011, Justin P. Mattock wrote:
> On 06/12/2011 01:27 PM, Rafael J. Wysocki wrote:
> > On Sunday, June 12, 2011, Justin P. Mattock wrote:
> >> On 06/12/2011 11:35 AM, Rafael J. Wysocki wrote:
> >>> On Sunday, June 12, 2011, Justin P. Mattock wrote:
> >>>> On 06/12/2011 05:12 AM, Rafael J. Wysocki wrote:
> >>>>> Hi,
> >>>>>
> >>>>> On Thursday, June 09, 2011, Justin P. Mattock wrote:
> >>>>>> From: "Justin P. Mattock"<justinmattock@...il.com>
> >>>>>>
> >>>>>> sounds stupid, but taking a glance at the time, and seeing the wrong time, or what seemed
> >>>>>> wrong in dmesg, caused me to go into total check the time clock panic mode.. So the patch below adds:
> >>>>>> "UTC" Coordinated Universal Time abreviation to the printk so people like me dont flip out over the time!
> >>>>>>
> >>>>>> before:
> >>>>>> [    0.114915] Time:  1:47:03  Date: 06/09/11
> >>>>>>
> >>>>>> after:
> >>>>>> [    0.114728] Time:  5:46:02 UTC Date: 06/09/11
> >>>>>>
> >>>>>> Signed-off-by: Justin P. Mattock<justinmattock@...il.com>
> >>>>>
> >>>>> I suspect the goal is to mark messages printed by the PM trace code so that
> >>>>> they can be easily distinguished from messages from other sources to avoid
> >>>>> confusion.  Why do you think it's a good idea to use the "UTC" string for
> >>>>> this purpose?  The time printed in those messages need not be UTC.
> >>>>>
> >>>>> It would be better to simply print "RTC time: ..., date: ..." IMO.
> >>>>>
> >>>>> Thanks,
> >>>>> Rafael
> >>>>>
> >>>>
> >>>> well.. if thats better, then thats better.. over here(people that dont
> >>>> know what RTC time is) would not get so confused with a simple UTC or
> >>>> PDT or whatever the time zone is but if RTC is bettr, then its better.
> >>>
> >>> My point is we don't know this time is always UTC, so we rather shouldn't
> >>> label it as UTC unconditionally, should we?
> >>>
> >>> Rafael
> >>>
> >>
> >> sounds good to me!!
> >
> > I'm not sure what you mean?
> >
> 
> with what you are saying "RTC" if anything.. rather than "UTC"

So, it looks like you'd like the appended patch to be appiled?

Rafael

---
From: Rafael J. Wysocki <rjw@...k.pl>
Subject: PM: Add "RTC" to PM trace time stamps to avoid confusion

Some users are apparently confused by dmesg output from
read_magic_time(), which looks like "real" time and date.
Add the "RTC" string to time stamps printed by read_magic_time() to
avoid that confusion.

Reported-by: Justin P. Mattock <justinmattock@...il.com>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/base/power/trace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/drivers/base/power/trace.c
===================================================================
--- linux-2.6.orig/drivers/base/power/trace.c
+++ linux-2.6/drivers/base/power/trace.c
@@ -112,7 +112,7 @@ static unsigned int read_magic_time(void
 	unsigned int val;
 
 	get_rtc_time(&time);
-	pr_info("Time: %2d:%02d:%02d  Date: %02d/%02d/%02d\n",
+	pr_info("RTC time: %2d:%02d:%02d, date: %02d/%02d/%02d\n",
 		time.tm_hour, time.tm_min, time.tm_sec,
 		time.tm_mon + 1, time.tm_mday, time.tm_year % 100);
 	val = time.tm_year;				/* 100 years */
--
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