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

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Message-ID: <20221018145749.GN5600@paulmck-ThinkPad-P17-Gen-1>
Date:   Tue, 18 Oct 2022 07:57:49 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        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, Oct 18, 2022 at 12:43:56PM +0200, Frederic Weisbecker wrote:
> On Tue, Oct 18, 2022 at 10:26:36AM +1100, Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the rcu tree, today's linux-next build (x86_64 allmodconfig)
> > failed like this:
> > 
> > ERROR: modpost: "srcu_check_nmi_safety" [arch/x86/kvm/kvm.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [arch/x86/kvm/kvm-intel.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [arch/x86/kvm/kvm-amd.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [kernel/rcu/rcutorture.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [kernel/rcu/rcuscale.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [kernel/rcu/refscale.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [fs/dlm/dlm.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [drivers/pci/controller/vmd.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [drivers/char/ipmi/ipmi_msghandler.ko] undefined!
> > ERROR: modpost: "srcu_check_nmi_safety" [drivers/gpu/drm/drm.ko] undefined!
> > WARNING: modpost: suppressed 10 unresolved symbol warnings because there were too many)
> > 
> > Presumably caused by commit
> > 
> >   54a118fce487 ("srcu: Debug NMI safety even on archs that don't require it")
> 
> My bad. This commit indeed lacks this (Paul can you add the following
> line on that commit?):
> 
> diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
> index 382236dd5e46..bcd629f5f902 100644
> --- a/kernel/rcu/srcutree.c
> +++ b/kernel/rcu/srcutree.c
> @@ -651,6 +651,7 @@ void srcu_check_nmi_safety(struct srcu_struct *ssp, bool nmi_safe)
>  	}
>  	WARN_ONCE(old_nmi_safe_mask != nmi_safe_mask, "CPU %d old state %d new state %d\n", sdp->cpu, old_nmi_safe_mask, nmi_safe_mask);
>  }
> +EXPORT_SYMBOL_GPL(srcu_check_nmi_safety);
>  #endif /* CONFIG_PROVE_RCU */

On my list for the next rebase, thank you both!  Along with kernel
test robot.  ;-)

							Thanx, Paul