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

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Date:	Sat, 16 Oct 2010 17:58:50 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Linux\/m68k" <linux-m68k@...r.kernel.org>
Subject: Re: [PATCH 22/22] bitops: remove minix bitops from asm/bitops.h

Akinobu Mita <akinobu.mita@...il.com> writes:

> 2010/10/16 Andreas Schwab <schwab@...ux-m68k.org>:
>> Akinobu Mita <akinobu.mita@...il.com> writes:
>>
>>> m68knommu is big-endian minixfs but m68k (mmu) is little-endian minixfs
>>> if I read arch/m68k/include/asm/bitops_{mm,no}.h correctly.
>>
>> Don't be confused by ^16, this is for the 16bit/32bit indexing
>> correction.  The nommu version uses big-endian 32bit indexing which yet
>> another format.
>
> Oh, I see. I misunderstood.
>
> So we need a special handling for it to keep compatibility.

IMHO we only need two versions: big-endian filesystem with big-endian
16bit indexed bitmaps and little-endian filesystem with little-endian
bitmaps.  The rest is just the result of careless copying.  Note that
the minix filesystem does no byte swapping, so native byte order is the
only sensible mode.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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