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Re: ext4dev build failure on mips: "empty_zero_page" undefined

To: Vorobiev Dmitri <dmitri.vorobiev@movial.fi>
Subject: Re: ext4dev build failure on mips: "empty_zero_page" undefined
From: Thiemo Seufer <ths@networkno.de>
Date: Thu, 5 Jun 2008 22:51:52 +0100
Cc: Theodore Tso <tytso@MIT.EDU>, Martin Michlmayr <tbm@cyrius.com>, Ralf Baechle <ralf@linux-mips.org>, Dmitri Vorobiev <dmitri.vorobiev@gmail.com>, linux-mips@linux-mips.org, linux-ext4@vger.kernel.org
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Vorobiev Dmitri wrote:
> Theodore Tso wrote:
> >
> > If you really insist I suppose we could have a MIPS specific patch
> > where we allocate a 4k page and zero it, so we can use it from our
> > kernel code because you don't want to export and make available the
> > ZERO_PAGE that gets used by the rest of the kernel, but that seems
> > awfully silly, and would be a waste of 4k of memory.....  Someone from
> > MIPS land would have to test it, as well, as I dont think any of the
> > ext4 developers have access to a MIPS platform.
> 
> Ted, Ralf seems to be unwilling to accept the ZERO_PAGE() export. If you
> send the MIPS-specific patch, I can do the testing for you as I have a
> MIPS Malta board at my disposal.

AFAIU the problematic case are systems with R4000/R4400 SC/MC CPUs
since they use 8 zero pages of different color. Have a look at
arch/mips/mm/init.c:setup_zero_pages.


Thiemo

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