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

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Date:	Fri, 06 Jun 2008 09:57:48 +0300
From:	Dmitri Vorobiev <dmitri.vorobiev@...ial.fi>
To:	Thiemo Seufer <ths@...workno.de>
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

Thiemo Seufer wrote:
> 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.

OK, thanks for the info. However, I won't be able to tackle into the
issue during this and the next week as I'm having a business trip.
Therefore, if the issue is urgent, I'd be grateful if someone could take
over.

Thanks,
Dmitri
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