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

To: Thiemo Seufer <>
Subject: Re: ext4dev build failure on mips: "empty_zero_page" undefined
From: Dmitri Vorobiev <>
Date: Fri, 06 Jun 2008 09:57:48 +0300
Cc: Theodore Tso <tytso@MIT.EDU>, Martin Michlmayr <>, Ralf Baechle <>, Dmitri Vorobiev <>,,
In-reply-to: <>
Organization: Movial Creative Technologies
Original-recipient: rfc822;
References: <> <> <> <> <> <> <> <> <> <> <>
User-agent: Icedove (X11/20080509)
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


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