linux-kernel - Re: linux-next: build failure after merge of the rcu tree

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Message-ID: <20150902071439.GM4029@linux.vnet.ibm.com>
Date:	Wed, 2 Sep 2015 00:14:39 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>, peterz@...radead.org
Subject: Re: linux-next: build failure after merge of the rcu tree

On Tue, Sep 01, 2015 at 11:40:51PM -0700, Davidlohr Bueso wrote:
> On Tue, 2015-09-01 at 22:26 -0700, Paul E. McKenney wrote:
> > Davidlohr, the error is due to sched_setscheduler_nocheck() not being
> > exported, so that Stephen gets this failure when building modules.
> > This is 04be76a9b067 (locktorture: Support rtmutex torturing) in -rcu.
> > 
> > Thoughts?
> 
> Right, the below should take care of it. Although I think it makes sense
> to get this into at least 4.3 even if we won't use it until 4.4. Simply
> because we already export sched_setscheduler(). If you agree I guess we
> could route via -tip.

Given an ack from Peter or Ingo, I would happy to queue it.  But we are
talking 4.4 rather than 4.3, sorry!

							Thanx, Paul

> Thanks,
> Davidlohr
> 
> ----8<------------------------------------
> Subject: [PATCH -next] sched: Export sched_setscheduler_nocheck
> 
> ... just like regular sched_setscheduler(). We need this, for locktorture
> otherwise we can fail to build modules, ie:
> 
> ERROR: "sched_setscheduler_nocheck" [kernel/locking/locktorture.ko] undefined!
> 
> Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: Ingo Molnar <mingo@...nel.org>
> ---
>  kernel/sched/core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 3595403..7b51f64 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4012,6 +4012,7 @@ int sched_setscheduler_nocheck(struct task_struct *p, int policy,
>  {
>  	return _sched_setscheduler(p, policy, param, false);
>  }
> +EXPORT_SYMBOL_GPL(sched_setscheduler_nocheck);
> 
>  static int
>  do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)
> -- 
> 2.1.4
> 
> 
> 

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