Re: [PATCH] joydev: fix HZ->millisecond transformation

Joe Korty (jak@rudolph.ccur.com)
Fri, 20 Dec 2002 09:52:28 -0500 (EST)


[ repost -- I am going to have to get outgoing mail fixed on my lkml-reading
machine ]

> On Fri, Dec 20, 2002 at 02:41:50AM -0800, george anzinger wrote:
>> Bjorn Helgaas wrote:
>>>
>>> * fix a problem with HZ->millisecond transformation on
>>> non-x86 archs (from 2.5 change by vojtech@suse.cz)
>>> [...]
>>> +#define MSECS(t) (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)
>>> [...]
> Though it might be easier to say (1000 * t) / HZ, now that I think about
> it.

The more complex version avoids integer overflow for more values of 't'
in the (1000 * t) subexpression.

Joe
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