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

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Message-ID: <20200528210320.GA22278@paulmck-ThinkPad-P72>
Date:   Thu, 28 May 2020 14:03:21 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: linux-next: build failure after merge of the rcu tree

On Thu, May 28, 2020 at 09:33:59AM -0700, Paul E. McKenney wrote:
> On Thu, May 28, 2020 at 07:05:01PM +1000, Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the rcu tree, today's linux-next build (powercp
> > allyesconfig) failed like this:
> > 
> > ld: kernel/rcu/refperf.o:(.discard+0x0): multiple definition of `__pcpu_unique_srcu_ctl_perf_srcu_data'; kernel/rcu/rcuperf.o:(.discard+0x0): first defined here
> > 
> > Caused by commit
> > 
> >   786a25497743 ("refperf: Add a test to measure performance of read-side synchronization")
> > 
> > From srcutree.h:
> > 
> >  * Note that although DEFINE_STATIC_SRCU() hides the name from other
> >  * files, the per-CPU variable rules nevertheless require that the
> >  * chosen name be globally unique.
> > 
> > I have applied the following patch for today.
> 
> I have a patch queued, but it is currently blocked by other broken
> commits which I expect to have straightened out today.
> 
> Yet again, please accept my apologies for the hassle!

And this is now in rcu/next.

							Thanx, Paul