linux-ext4 - Re: ext4dev build failure on mips: "empty_zero

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Message-ID: <20080605215152.GB15504@networkno.de>
Date:	Thu, 5 Jun 2008 22:51:52 +0100
From:	Thiemo Seufer <ths@...workno.de>
To:	Vorobiev Dmitri <dmitri.vorobiev@...ial.fi>
Cc:	Theodore Tso <tytso@....EDU>, Martin Michlmayr <tbm@...ius.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Dmitri Vorobiev <dmitri.vorobiev@...il.com>,
	linux-mips@...ux-mips.org, linux-ext4@...r.kernel.org
Subject: Re: ext4dev build failure on mips: "empty_zero_page" undefined

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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