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

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Message-ID: <20150902052612.GK4029@linux.vnet.ibm.com>
Date:	Tue, 1 Sep 2015 22:26:13 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <dave@...olabs.net>
Subject: Re: linux-next: build failure after merge of the rcu tree

On Wed, Sep 02, 2015 at 01:58:00PM +1000, Stephen Rothwell wrote:
> Hi Paul,
> 
> On Tue, 1 Sep 2015 00:49:46 -0700 "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> >
> > On Tue, Sep 01, 2015 at 01:50:06PM +1000, Stephen Rothwell wrote:
> > > 
> > > After merging the rcu tree, today's linux-next build (x86_64 allmodconfig)
> > > failed like this:
> > > 
> > > ERROR: "sched_setscheduler_nocheck" [kernel/locking/locktorture.ko] undefined!
> > > ERROR: "percpu_down_write" [kernel/locking/locktorture.ko] undefined!
> > > ERROR: "percpu_up_write" [kernel/locking/locktorture.ko] undefined!
> > > ERROR: "percpu_down_read" [kernel/locking/locktorture.ko] undefined!
> > > ERROR: "percpu_up_read" [kernel/locking/locktorture.ko] undefined!
> > > ERROR: "__percpu_init_rwsem" [kernel/locking/locktorture.ko] undefined!
> > > 
> > > Caused by commits
> > > 
> > >   04be76a9b067 ("locktorture: Support rtmutex torturing")
> > >   40b2996f9b32 ("locktorture: Add torture tests for percpu_rwsem")
> > > 
> > > and maybe more.
> > > 
> > > I have used the rcu tree from next-20150831 for today.
> > 
> > It is looking like I will be deferring these to v4.4, apologies for
> > the hassle!
> 
> This still fails to build but now I only get the error about
> sched_setscheduler_nocheck.

OK, now I actually have deferred these to v4.4.

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?

							Thanx, Paul

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