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

From: "Paul E. McKenney" <[email-masked]>
Date: Wed, 17 Mar 2021 07:23:50 -0700

On Wed, Mar 17, 2021 at 04:36:13PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the rcu tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
> 
> ERROR: modpost: "rcu_read_lock_longwait_held" [kernel/rcu/rcutorture.ko] undefined!
> ERROR: modpost: "rcu_read_unlock_longwait" [kernel/rcu/rcutorture.ko] undefined!
> ERROR: modpost: "rcu_read_lock_longwait" [kernel/rcu/rcutorture.ko] undefined!
> 
> Caused by commit
> 
>   bd6ae31d1b1f ("rcutorture: Add the ability to torture RCU longsleep")
> 
> CONFIG_LONGWAIT_RCU=y
> CONFIG_RCU_TORTURE_TEST=m
> 
> I have used the rcu tree from next-20210316 for today.

Gah!  Rebase first, then retest, -then- adjust rcu/next...

Will fix, apologies for the hassle!

							Thanx, Paul