linux-kernel - linux-next: block tree build failure

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Message-Id: <20091204143612.f30db275.sfr@canb.auug.org.au>
Date:	Fri, 4 Dec 2009 14:36:12 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>
Subject: linux-next: block tree build failure

Hi Jens,

Today's linux-next build (x86_64 allmodconfig) failed like this:

block/built-in.o: In function `blkiocg_destroy':
blk-cgroup.c:(.text+0x1bd48): undefined reference to `cfq_unlink_blkio_group'
block/built-in.o: In function `blkiocg_weight_write':
blk-cgroup.c:(.text+0x1c0d2): undefined reference to `cfq_update_blkio_group_weight'

Caused by commits b1c3576961847da26c91b1e97f226bb66be5fa3f ("blkio: Take
care of cgroup deletion and cfq group reference counting") and
f8d461d692c341add957fb973fb5ee1f62039dc7 ("blkio: Propagate cgroup weight
updation to cfq groups").

When adding code that is CONFIG dependent, please build test it with and
without the relevant CONFIG setting (in this case
CONFIG_CFQ_GROUP_IOSCHED).  Also put the extern declarations of global
functions into a header file.

I have used the version of the block tree from next-20091203 for today.
-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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