linux-kernel - Re: [-mm patch] add timespec_to_us() and use it in kernel/tsacct.c

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Date:	Tue, 8 Aug 2006 10:02:28 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Adrian Bunk <bunk@...sta.de>, Matt Reuther <mreuther@...ch.edu>,
	LKML <linux-kernel@...r.kernel.org>, Jay Lan <jlan@....com>
Subject: Re: [-mm patch] add timespec_to_us() and use it in kernel/tsacct.c

Andrew Morton writes:
> On Mon, 7 Aug 2006 15:32:41 +0200
> Adrian Bunk <bunk@...sta.de> wrote:
> > This doesn't look correct since do_div() does not guarantee to return 
> > more than 32bit.
> 
> eh?  We use do_div() to do 64bit/something all the time??

Indeed.  If do_div didn't return a 64-bit quotient then
printk("%lld", ...) wouldn't work.  (The remainder is 32-bit of course,
because the divisor is 32-bit.)

Paul.

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