linux-kernel - Re: mmotm 2010-01-13-12-17 uploaded (cgroup)

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Message-Id: <20100117180314.247bac92.randy.dunlap@oracle.com>
Date:	Sun, 17 Jan 2010 18:03:14 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Ben Blum <bblum@...rew.cmu.edu>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: mmotm 2010-01-13-12-17 uploaded (cgroup)

On Thu, 14 Jan 2010 12:20:06 -0500 Ben Blum wrote:

> On Thu, Jan 14, 2010 at 08:07:48AM -0800, Randy Dunlap wrote:
> > On Wed, 13 Jan 2010 12:17:36 -0800 akpm@...ux-foundation.org wrote:
> > 
> > > The mm-of-the-moment snapshot 2010-01-13-12-17 has been uploaded to
> > > 
> > >    http://userweb.kernel.org/~akpm/mmotm/
> > > 
> > > and will soon be available at
> > > 
> > >    git://zen-kernel.org/kernel/mmotm.git
> > 
> > 
> > patch:  cgroups-subsystem-module-unloading.patch
> > 
> > When CONFIG_MODULE_UNLOAD is not enabled:
> > 
> > kernel/cgroup.c:1013: error: implicit declaration of function 'module_refcount'
> > 
> > 
> > 
> > ---
> > ~Randy
> > 
> 
> Argh, my fault. try_module_get and module_put tricked me by not
> depending on that config option while module_refcount did. Fix here:
> 
> From: Ben Blum <bblum@...rew.cmu.edu>
> Signed-off-by: Ben Blum <bblum@...rew.cmu.edu>
> 
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 391ff41..32e001e 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -964,7 +964,9 @@ static int rebind_subsystems(struct cgroupfs_root *root,
>  			 * drop the extra reference.
>  			 */
>  			module_put(ss->module);
> +#ifdef CONFIG_MODULE_UNLOAD
>  			BUG_ON(ss->module && !module_refcount(ss->module));
> +#endif
>  		} else {
>  			/* Subsystem state shouldn't exist */
>  			BUG_ON(cgrp->subsys[i]);

Thanks.

Acked-by: Randy Dunlap <randy.dunlap@...cle.com>

---
~Randy
--
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