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

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Message-ID: <20091204135422.GZ8742@kernel.dk>
Date:	Fri, 4 Dec 2009 14:54:22 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: linux-next: block tree build failure

On Fri, Dec 04 2009, Jens Axboe wrote:
> On Fri, Dec 04 2009, Stephen Rothwell wrote:
> > 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.
> 
> The problem looks like a circular dependency betwen BLK_CGROUP and CFQ.
> The Kconfig dependencies doesn't express that blk-cgroup also calls into
> cfq, so you can't have cfq=m (cfq doesn't even export those functions).
> It looks pretty messy, to be honest. I'll see if I can fix it up.

I pushed out the quick fix, just disallowing cfq=m and blk cgroup in
Kconfig. So it should work now.

-- 
Jens Axboe

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