linux-kernel - Re: [PATCH] Provide u64 version of jiffies_to

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Message-Id: <200802192159.m1JLxRva003071@sabah.engr.sgi.com>
Date:	Tue, 19 Feb 2008 13:59:27 -0800 (PST)
From:	Jonathan Lim <jlim@....com>
To:	randy.dunlap@...cle.com (Randy Dunlap)
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] Provide u64 version of jiffies_to_usecs() in

On Tue Feb 19 13:25:25 2008, randy.dunlap@...cle.com wrote:
> 
> > +u64 inline jiffies_64_to_usecs(const u64 j)
> > +{
> > +	u64 tmp = j*HZ_TO_USEC_NUM + HZ_TO_USEC_DEN-1;
> > +	do_div(tmp, HZ_TO_USEC_DEN);
> 
> do_div() is:
>  * The semantics of do_div() are:
>  *
>  * uint32_t do_div(uint64_t *n, uint32_t base)
> 
> Maybe you want div64_64().
> 
> > +	return tmp;
> > +}
> > +EXPORT_SYMBOL(jiffies_64_to_usecs);
> > +

In include/asm-generic/div64.h, div64_64(uint64_t dividend, uint64_t divisor)
just returns (dividend / divisor).  Isn't this the same as what I had before
in jiffies_64_to_usecs(), except that the arguments are of type u64?

Jonathan
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