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SubjectRe: next Feb 13 drivers/scsi/aha1542.ko build break

* James Bottomley <James.Bottomley@HansenPartnership.com> wrote:

> On Fri, 2009-02-13 at 10:22 -0800, Randy Dunlap wrote:
> > Sachin P. Sant wrote:
> > > Feb 13 next x86 allmodconfig build breaks with
> > >
> > > ERROR: "__udivdi3" [drivers/scsi/aha1542.ko] undefined!
> > >
> > > .config attached.
> >
> >
> > I'm seeing that also. I think that it's this line in aha1542.c:
> >
> > 495: mbo = (scsi2int(mb[mbi].ccbptr) - (SCSI_BUF_PA(&ccb[0]))) / sizeof(struct ccb);
> >
> > since I can comment out the "/ sizeof(struct ccb)" and the driver builds successfully.
> >
> > This may need a patch to use one of the div() macros (?).
>
> It shouldn't ... the two inputs should be longs and the sizeof should be
> dividing by a constant size_t. __udivdi3 is used for 64 bit division on
> a 32 bit platform, so where's it getting the idea that something in the
> division is 64 bit?
>
> The culprit looks to be
>
> commit 976e8f677e42757e5586ea04a9ac8bb8ddaa037e
> Author: Jeremy Fitzhardinge <jeremy@goop.org>
> Date: Fri Feb 6 13:29:44 2009 -0800
>
> x86: asm/io.h: unify virt_to_phys/phys_to_virt
>
> Because it changed the return of virt_to_phys from long to phys_addr_t
> which is unsigned long long on a PAE platform, which this is.
>
> So, I could suggest a fix below since isa addresses may never be above
> 32 bits, but I think this issue has more ramifications for the other
> legacy users of virt_to_phys.

Applied your fix to tip:x86/headers, thanks!

If something non-deep-legacy uses an ugly construct like this:

> > 495: mbo = (scsi2int(mb[mbi].ccbptr) - (SCSI_BUF_PA(&ccb[0]))) / sizeof(struct ccb);

The right fix will be to remove that division from that code ...

I wouldnt dare to touch the aha1542 driver though. OTOH, build testing
only came up with the aha1542 case so we should be good.

Ingo


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