linux-kernel - Re: [patch] timer_list should use signed numbers for relative times

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Message-ID: <je3aur4vps.fsf@sykes.suse.de>
Date:	Tue, 27 Nov 2007 15:19:27 +0100
From:	Andreas Schwab <schwab@...e.de>
To:	Pavel Machek <pavel@....cz>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	kernel list <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>
Subject: Re: [patch] timer_list should use signed numbers for relative times

Pavel Machek <pavel@....cz> writes:

> Hi!
>
>
>> > Relative times are signed by nature, and timers can (briefly) have
>> > expires in past. Print them as negative numbers.
>> >
>> > Signed-off-by: Pavel Machek <pavel@...e.cz>
>> >
>> > diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
>> > index 12c5f4c..7f6eaa9 100644
>> > --- a/kernel/time/timer_list.c
>> > +++ b/kernel/time/timer_list.c
>> > @@ -65,7 +65,7 @@ #ifdef CONFIG_TIMER_STATS
>> >  	SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
>> >  #endif
>> >  	SEQ_printf(m, "\n");
>> > -	SEQ_printf(m, " # expires at %Lu nsecs [in %Lu nsecs]\n",
>> > +	SEQ_printf(m, " # expires at %Lu nsecs [in %Ld nsecs]\n",
>> >  		(unsigned long long)ktime_to_ns(timer->expires),
>> >  		(unsigned long long)(ktime_to_ns(timer->expires) - now));
>> 
>> Perhaps change the cast as well.
>
> Well, that seems to be absolute time, so %Lu makes some sense...

I don't understand what this has to do with the cast.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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