linux-kernel - Re: kernel/cgroup_freezer.c:151:3: error: 'system_freezing

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Date:	Thu, 31 Jan 2013 15:14:33 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Chris Metcalf <cmetcalf@...era.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	kbuild test robot <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: kernel/cgroup_freezer.c:151:3: error: 'system_freezing_cnt'
 undeclared

Hello, guys.

On Fri, Feb 01, 2013 at 01:17:58AM +0800, kbuild test robot wrote:
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux master
> head:   04c2eee5b9dfcb13f3cd07a5537fb8c785f2751a
> commit: a3201227f803ad7fd43180c5195dbe5a2bf998aa freezer: make freezing() test freeze conditions in effect instead of TIF_FREEZE
> date:   1 year, 2 months ago

Heh, this gone goes way back.

> config: make ARCH=tile allyesconfig
> 
> All error/warnings:
> 
>    kernel/cgroup_freezer.c: In function 'freezer_destroy':
> >> kernel/cgroup_freezer.c:151:3: error: 'system_freezing_cnt' undeclared (first use in this function)
>    kernel/cgroup_freezer.c:151:3: note: each undeclared identifier is reported only once for each function it appears in
>    kernel/cgroup_freezer.c: In function 'freezer_fork':
>    kernel/cgroup_freezer.c:209:3: error: implicit declaration of function 'freeze_task'
>    kernel/cgroup_freezer.c: In function 'unfreeze_cgroup':
>    kernel/cgroup_freezer.c:296:3: error: implicit declaration of function '__thaw_task'
>    kernel/cgroup_freezer.c: In function 'freezer_change_state':
> >> kernel/cgroup_freezer.c:315:4: error: 'system_freezing_cnt' undeclared (first use in this function)

So, CONFIG_FREEZER is defbool which is turned on automatically if
CONFIG_CGROUP_FREEZER; however, CONFIG_FREEZER is defined in
Kconfig.freezer which should be included by arch Kconfig file.  tile
doesn't include it (maybe it doesn't want freezer for some reason?).
CONFIG_COGRUP_FREEZER is in init/Kconfig, so allyesconfig enables it
but as CONFIG_FREEZER definition isn't visible, we end up with broken
config CONFIG_CGROUP_FREEZER && !CONFIG_FREEZER.

Maybe we need to move CONFIG_CGROUP_FREEZER to Kconfig.freezer if tile
actually doesn't want freezer?

Thanks.

-- 
tejun
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