linux-kernel - Re: [PATCH] srcu: Export srcu_check_nmi

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Date:   Tue, 18 Oct 2022 12:45:33 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Zqiang <qiang1.zhang@...el.com>
Cc:     paulmck@...nel.org, joel@...lfernandes.org, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] srcu: Export srcu_check_nmi_safety() to modules

On Tue, Oct 18, 2022 at 09:39:06AM +0800, Zqiang wrote:
> When enable CONFIG_PROVE_RCU and built modules, the following
> error appear:
> 
> ERROR: modpost: "srcu_check_nmi_safety" [kernel/rcu/rcutorture.ko] undefined!
> ERROR: modpost: "srcu_check_nmi_safety" [kernel/rcu/rcuscale.ko] undefined!
> 
> This commit fix it by exporting the srcu_check_nmi_safety().
> 
> Signed-off-by: Zqiang <qiang1.zhang@...el.com>

Paul, whichever way you prefer, editing the commit or adding this
one on top.

Reviewed-by: Frederic Weisbecker <frederic@...nel.org>

Thanks.

> ---
>  kernel/rcu/srcutree.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> 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 */
>  
>  /*
> -- 
> 2.25.1
>