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SubjectRe: [PATCH] ide-disk.c rev 1.13 killed CONFIG_IDEDISK_STROKE

On Wed, 6 Aug 2003, Erik Andersen wrote:

> On Wed Aug 06, 2003 at 08:32:23PM +0200, Bartlomiej Zolnierkiewicz wrote:
> >
> > On Wed, 6 Aug 2003, Erik Andersen wrote:
> >
> > > > Can you please resend me the patch once its accepted in 2.6 ?
> > > >
> > > > Maybe we want to test it a while in -ac, also?
> > >
> > > Ok. Though it is being incorporated as part of a much larger
> > > patch in 2.6. I suppose that will filter back into 2.4 when
> > > it is ready,
> >
> > Hi Erik,
> >
> > I made init_idedisk_capacity() cleanup.
> > Then I ported your patch and reworked it a bit.
> >
> > Could you take a look?
>
> I like your improvements. The only concern I have is you
> retained my use of do_div() intact. That needs to change since
> it turns out that do_div() directly modifies the numerator
> (violating the principle of least surprise). See the recent
> thread on "do_div considered harmful". In that thread, Andries
> mentions he has made a generic sectors_to_MB() function to
> consolidate such things. which I think is a very good idea since
> then this only has to be correct once. That would also let you
> eliminate the somewhat ugly and not particularly obvious division
> plus rounding (X - X/625 + 974)/1950 sequence from
> idedisk_check_hpa_lba28(),

Oh yes... I forgot about do_div() and sectors_to_MB().
I will correct this before submitting to Linus.

Thanks,
--
Bartlomiej

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