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

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Message-ID: <20230522114503.7404d59c@canb.auug.org.au>
Date:   Mon, 22 May 2023 11:45:03 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the rcu tree

Hi Paul,

On Thu, 18 May 2023 19:12:52 -0700 "Paul E. McKenney" <paulmck@...nel.org> wrote:
>
> On Fri, May 19, 2023 at 10:59:50AM +1000, Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the rcu tree, today's linux-next build (x86_64 allmodconfig)
> > failed like this:
> > 
> > kernel/rcu/rcuscale.c:340:27: error: 'get_rcu_tasks_trace_gp_kthread' undeclared here (not in a function); did you mean 'show_rcu_tasks_trace_gp_kthread'?
> >   340 |         .rso_gp_kthread = get_rcu_tasks_trace_gp_kthread,
> >       |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >       |                           show_rcu_tasks_trace_gp_kthread
> > 
> > Caused by commit
> > 
> >   9bb839a83e1b ("rcuscale: Measure grace-period kthread CPU time")
> > 
> > CONFIG_RCU_SCALE_TEST=m
> > 
> > I have used the rcu tree from next-20230518 for today.  
> 
> Huh.  Modules and #ifdefs trip me up again.  Will fix, and thank you
> for catching it!

This is now:

ERROR: modpost: "get_rcu_tasks_trace_gp_kthread" [kernel/rcu/rcuscale.ko] undefined!

I have used the rcu tree from next-20230518 again for today.
-- 
Cheers,
Stephen Rothwell

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