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

From: Stephen Rothwell <[email-masked]>
Date: Mon, 22 May 2023 11:45:03 +1000

Hi Paul,

On Thu, 18 May 2023 19:12:52 -0700 "Paul E. McKenney" <[email-masked]> 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