linux-kernel - Re: [microblaze-uclinux] Re: [PATCH v2 22/22] bitops: remove minix bitops from asm/bitops.h

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Date:	Mon, 25 Oct 2010 15:31:35 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	monstr@...str.eu
Cc:	microblaze-uclinux@...e.uq.edu.au, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [microblaze-uclinux] Re: [PATCH v2 22/22] bitops: remove minix bitops from asm/bitops.h

On Monday 25 October 2010, Michal Simek wrote:
> > If upcomming microblade little-endian mode will use little-endian
> > bitmaps for minixfs, microblade can continue to select
> > CONFIG_MINIX_FS_NATIVE_ENDIAN and you don't need to change it.
> > 
> > But if it will use big-endian bitmaps, it may need some extra work
> > to support it. Becuase there is no little-endian architecture
> > which uses bit-endian bitmaps for minixfs.
> 
> As I wrote I don't know anybody who wants to use minixfs that's why we don't
> need to do anything with it. I can test it but it has no high priority.

I think it needs to be set up in a way that new architectures (and those
that never cared about minixfs) automatically get a reasonable default
and should not need to set anything.

I don't see a reason why little-endian microblaze should use big-endian
bitops in minixfs, since that file system layout would also be incompatible
with every other one.

CONFIG_MINIX_FS_NATIVE_ENDIAN seems reasonable for both big- and little-
endian microblaze, but new architectures should just keep the default
little-endian bitops IMHO.
I also don't see a reason for testing. Any new users on microblaze or
future architectures would use a modern file system anyway.

	Arnd
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