linux-kernel - Re: [PATCH] Fix ext4 bitops

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Date:	Mon, 4 Feb 2008 14:59:34 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Bastian Blank <bastian@...di.eu.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-s390@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Fix ext4 bitops

On Mon, Feb 04, 2008 at 10:24:36AM +0100, Heiko Carstens wrote:
> > > > > | fs/ext4/mballoc.c: In function 'ext4_mb_generate_buddy':
> > > > > | fs/ext4/mballoc.c:954: error: implicit declaration of function 'generic_find_next_le_bit'
> > > > > 
> > > > > The s390 specific bitops uses parts of the generic implementation.
> > > > > Include the correct header.
> > > > 
> > > > That doesn't work:
> > > > 
> > > > fs/built-in.o: In function `ext4_mb_release_inode_pa':
> > > > mballoc.c:(.text+0x95a8a): undefined reference to `generic_find_next_le_bit'
> > > > fs/built-in.o: In function `ext4_mb_init_cache':
> > > > mballoc.c:(.text+0x967ea): undefined reference to `generic_find_next_le_bit'
> > > > 
> > > > This still needs generic_find_next_le_bit which comes
> > > > from lib/find_next_bit.c. That one doesn't get built on s390 since we
> > > > don't set GENERIC_FIND_NEXT_BIT.
> > > > Currently we have the lengthly patch below queued.
> > > 
> > > Similar issue on m68k. As Bastian also saw it on powerpc, I'm getting the
> > > impression the ext4 people don't (compile) test on big endian machines?
> > > 
> > > Gr{oetje,eeting}s,
> > > 
> > 
> > I have sent this patches to linux-arch expecting a review from
> > different arch people. It is true that the patches are tested only on
> > powerpc, x86-64, x86. That's the primary reason of me sending the
> > patches to linux-arch.
> 
> Is there anything special I need to do so the ext4 code actually uses
> ext2_find_next_bit() ? Haven't looked at the ext4 code, but I'd like to
> test if the s390 implementation is ok.

With the latest linus kernel in git you can test it by mounting  ext4

mount -t ext4dev <device> <mntpoint>


-aneesh
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