linux-kernel - Re: [openib-general] [PATCH 2.6.19 2/4] ehca: hcp_phyp.c: correct page mapping in 64k page mode

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Date:	Mon, 13 Nov 2006 17:40:52 +0100
From:	Christoph Raisch <RAISCH@...ibm.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	openib-general@...nib.org, openib-general-bounces@...nib.org,
	"Roland Dreier" <rdreier@...co.com>
Subject: Re: [openib-general] [PATCH 2.6.19 2/4] ehca: hcp_phyp.c: correct page
 mapping in 64k page mode



> Christoph Raisch writes:
>
> > The patch is needed. We've seen it on the real system. We did fix it on
the
> > real system.
>
> I disagree that the ioremap change is needed.
>
> > ...and it conforms to theory... although theory is a bit confusing
here.
> >
> > let me try to summarize:
> > ioremap checks for 64k boundary (actually page boundary)
>
> Actually, ioremap itself already does the calculations that your patch
> adds - that is, it generates the offset within the page and the
> physical address of the start of the page, does the mapping using the
> latter, then adds on the offset to the virtual address of the page and
> returns that.

Paul,
you are right. The calculation is done in your code already.
We can't reproduce the problem anymore on latest kernel.
Was this calculation there in ioremap right from the start with 64k on
POWER or added later on?

So Roland, feel free to ignore that line where we do the calculation.

>
> Paul.

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