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Date: Mon, 6 Feb 2017 15:52:03 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Mike Galbraith <efault@gmx.de>, Oleg Nesterov <oleg@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 58/89] sched/headers: Move the 'root_task_group'
 declaration to <linux/sched/autogroup.h>
Message-ID: <20170206145203.GM6515@twins.programming.kicks-ass.net>
References: <1486387772-18837-1-git-send-email-mingo@kernel.org>
 <1486387772-18837-59-git-send-email-mingo@kernel.org>
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On Mon, Feb 06, 2017 at 02:29:01PM +0100, Ingo Molnar wrote:
> diff --git a/include/linux/sched/autogroup.h b/include/linux/sched/autogroup.h
> index c0810fe196f4..55cd496df884 100644
> --- a/include/linux/sched/autogroup.h
> +++ b/include/linux/sched/autogroup.h

> @@ -23,4 +24,8 @@ static inline void sched_autogroup_exit(struct signal_struct *sig) { }
>  static inline void sched_autogroup_exit_task(struct task_struct *p) { }
>  #endif
>  
> +#ifdef CONFIG_CGROUP_SCHED
> +extern struct task_group root_task_group;
> +#endif /* CONFIG_CGROUP_SCHED */
> +
>  #endif /* _LINUX_SCHED_AUTOGROUP_H */

That's a bit weird. It has nothing to do with autogroup.