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

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Date:   Mon, 18 Apr 2022 20:31:26 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        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

On Tue, Apr 19, 2022 at 12:36:24PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the rcu tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
> 
> In file included from kernel/rcu/tree.c:5031:
> kernel/rcu/tree_nocb.h: In function 'rcu_init_nohz':
> kernel/rcu/tree_nocb.h:1162:14: error: 'rcu_nocb_is_setup' undeclared (first use in this function); did you mean 'rcu_nocb_setup'?
>  1162 |         if (!rcu_nocb_is_setup) {
>       |              ^~~~~~~~~~~~~~~~~
>       |              rcu_nocb_setup
> kernel/rcu/tree_nocb.h:1162:14: note: each undeclared identifier is reported only once for each function it appears in
> 
> Caused by commit
> 
>   d6932dca19b1 ("rcu/nocb: Add an option to offload all CPUs on boot")
> 
> interacting with commit
> 
>   8d2aaa9b7c29 ("rcu/nocb: Move rcu_nocb_is_setup to rcu_state")
> 
> I have used the rcu tree from next-20220414 for today.

Again, apologies!

I have dropped that commit from -rcu and am retesting, and will update
rcu/next accordingly.

							Thanx, Paul