linux-kernel - Re: [PATCH 11/14] x86/entry: Clarify irq_{enter,exit}

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Message-ID: <20200602184720.GA1607@lca.pw>
Date:   Tue, 2 Jun 2020 14:47:20 -0400
From:   Qian Cai <cai@....pw>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, luto@...capital.net,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        sean.j.christopherson@...el.com, andrew.cooper3@...rix.com,
        daniel.thompson@...aro.org, a.darwish@...utronix.de,
        rostedt@...dmis.org, bigeasy@...utronix.de,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 11/14] x86/entry: Clarify irq_{enter,exit}_rcu()

On Tue, Jun 02, 2020 at 05:05:11PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 02, 2020 at 10:42:35AM -0400, Qian Cai wrote:
> 
> > Reverted this commit fixed the POWER9 boot warning,
> 
> ARGH, I'm an idiot. Please try this instead:
>
> 
> diff --git a/kernel/softirq.c b/kernel/softirq.c
> index a3eb6eba8c41..c4201b7f42b1 100644
> --- a/kernel/softirq.c
> +++ b/kernel/softirq.c
> @@ -438,7 +438,7 @@ void irq_exit_rcu(void)
>   */
>  void irq_exit(void)
>  {
> -	irq_exit_rcu();
> +	__irq_exit_rcu();
>  	rcu_irq_exit();
>  	 /* must be last! */
>  	lockdep_hardirq_exit();

This works fine.