linux-kernel - Re: [PATCH v2] power: new trace event to print device suspend and resume time

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Date:	Wed, 17 Jul 2013 17:10:06 +0000
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Joe Perches <joe@...ches.com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>
Cc:	"rjw@...k.pl" <rjw@...k.pl>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"pavel@....cz" <pavel@....cz>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>,
	Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCH v2] power: new trace event to print device suspend and
 resume time

On 07/17/2013 10:41 AM, Joe Perches wrote:

> I think the easiest way to "fix" it is to change
> the TP_printk format to:
>
> 	TP_printk("%s %s parent=%s state=%s ops=%susecs=%lld err=%d",

I will just adjust for the space and add a comment.

>
>> Hence, I chose to leave the extra space in. I also
>> didn't want to propagate that assumption that there is an extra space
>> into this new tracepoint.
>
> It's a big deal, it just seemed untidy.
>
> There are a couple of places in drivers/base/power/main.c
> where info is set to NULL.  I didn't look hard to see if
> any of those are propagated through to this point, but
> there are uses of 'info ?: ""' for some of the logging
> messages.  That _might_ an issue.
>
> It looks like all the other logging message uses of info
> have "%s%s" so that proper word spacing is done when
> info is "" or NULL.
>

Yeah that would be bad. The safe thing might me to add a info null 
check. Working on v3 that includes Steve's review comment as well.

thanks,
-- Shuah

Shuah Khan, Linux Kernel Developer - Open Source Group Samsung Research 
America (Silicon Valley) shuah.kh@...sung.com | (970) 672-0658
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