linux-kernel - Re: [PATCH 7/8] Adds functionality to read/write lock CLONE

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Date:	Fri, 21 Aug 2009 00:24:03 -0400
From:	Ben Blum <bblum@...rew.cmu.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org
Subject: Re: [PATCH 7/8] Adds functionality to read/write lock CLONE_THREAD fork()ing per-threadgroup

On Thu, Aug 20, 2009 at 02:13:56PM -0700, Andrew Morton wrote:
> On Wed, 19 Aug 2009 19:45:11 -0700
> Paul Menage <menage@...gle.com> wrote:
> 
> > On Wed, Aug 19, 2009 at 7:39 PM, Li Zefan<lizf@...fujitsu.com> wrote:
> > >
> > >> + __ __ __ __ __ __ list_for_each_entry_rcu(p, &tsk->thread_group, thread_group) {
> > >> + __ __ __ __ __ __ __ __ __ __ if (p->sighand) {
> > >> + __ __ __ __ __ __ __ __ __ __ __ __ __ __ sighand = tsk->sighand;
> 
> (^^ who did that?)
> 

The tsk->sighand? Likely me. I'm surprised it took that many pairs of eyes
to catch it.

> > >
> > > s/tsk->sighand/p->sighand
> > 
> > Good catch, thanks. Fixed.
> > 
> 
> I see no fix anywhere so I did this:
> 
> --- a/kernel/cgroup.c~cgroups-add-functionality-to-read-write-lock-clone_thread-forking-per-threadgroup-fix
> +++ a/kernel/cgroup.c
> @@ -1557,7 +1557,7 @@ struct sighand_struct *threadgroup_fork_
>  		rcu_read_lock();
>  		list_for_each_entry_rcu(p, &tsk->thread_group, thread_group) {
>  			if (p->sighand) {
> -				sighand = tsk->sighand;
> +				sighand = p->sighand;
>  				break;
>  			}
>  		}
> 
> 
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