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

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Message-Id: <201010211710.10736.arnd@arndb.de>
Date:	Thu, 21 Oct 2010 17:10:10 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Ungerer <gerg@...inux.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	linux-m68k@...ts.linux-m68k.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Michal Simek <monstr@...str.eu>,
	microblaze-uclinux@...e.uq.edu.au,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org,
	Hirokazu Takata <takata@...ux-m32r.org>,
	linux-m32r@...linux-m32r.org, Ralf Baechle <ralf@...ux-mips.org>,
	linux-mips@...ux-mips.org, Paul Mundt <lethal@...ux-sh.org>,
	linux-sh@...r.kernel.org, Chris Zankel <chris@...kel.net>
Subject: Re: [PATCH v2 22/22] bitops: remove minix bitops from asm/bitops.h

On Thursday 21 October 2010, Akinobu Mita wrote:
> minix bit operations are only used by minix filesystem and useless
> by other modules. Because byte order of inode and block bitmaps is
> defferent on each architecture like below:
> 
> m68k:
> 	big-endian 16bit indexed bitmaps
> 
> h8300, microblaze, s390, sparc, m68knommu:
> 	big-endian 32 or 64bit indexed bitmaps
> 
> m32r, mips, sh, xtensa:
> 	big-endian 32 or 64bit indexed bitmaps for big-endian mode
> 	little-endian bitmaps for little-endian mode
> 
> Others:
> 	little-endian bitmaps
> 
> In order to move minix bit operations from asm/bitops.h to
> architecture independent code in minix file system, this provides two
> config options.
> 
> CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED is only selected by m68k.
> CONFIG_MINIX_FS_NATIVE_ENDIAN is selected by the architectures which
> use native byte order bitmaps (h8300, microblaze, s390, sparc,
> m68knommu, m32r, mips, sh, xtensa).
> The architectures which always use little-endian bitmaps do not select
> these options.
> 
> Finally, we can remove minix bit operations from asm/bitops.h for
> all architectures.
> 
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>

Acked-by: Arnd Bergmann <arnd@...db.de>
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