linux-kernel - Re: [RFC PATCH] time: Fix truncation in jiffies_to

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Message-ID: <CA+8MBb+E_zT47qu4a6pqQWArrhs0gv1W=JKoy252_-Uw6HfbkA@mail.gmail.com>
Date:	Mon, 7 Apr 2014 22:34:51 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Mauro Chehab <m.chehab@...sung.com>
Subject: Re: [RFC PATCH] time: Fix truncation in jiffies_to_usecs()

On Mon, Apr 7, 2014 at 3:25 PM, Tony Luck <tony.luck@...el.com> wrote:

> c) If not this ... then what? Separate routine to convert large numbers
>    of jiffies to usec/nsecs?  Should we make the existing one barf when
>    handed a number that overflows?

Having thought about this a bit more - I'm leaning towards leaving
jiffies_to_usecs() alone, but using it as a model for a from-scratch
implementation of:
u64 jiffies_to_nsecs(const unsigned long j)
{
}

This is what the uptime tracer actually needs - and there is only
one user of jiffies_to_nsecs() to worry about.

-Tony
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