linux-kernel - Re: [PATCH v2 2/2] x86/xen: Make the secondary CPU idle tasks reliable

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Message-ID: <alpine.LSU.2.21.2003191131280.24428@pobox.suse.cz>
Date:   Thu, 19 Mar 2020 11:38:34 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Jan Beulich <jbeulich@...e.com>
cc:     boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, jpoimboe@...hat.com,
        andrew.cooper3@...rix.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        xen-devel@...ts.xenproject.org, jslaby@...e.cz
Subject: Re: [PATCH v2 2/2] x86/xen: Make the secondary CPU idle tasks
 reliable

On Thu, 19 Mar 2020, Jan Beulich wrote:

> On 19.03.2020 10:56, Miroslav Benes wrote:
> > --- a/arch/x86/xen/smp_pv.c
> > +++ b/arch/x86/xen/smp_pv.c
> > @@ -53,6 +53,7 @@ static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
> >  static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
> >  
> >  static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
> > +extern unsigned char asm_cpu_bringup_and_idle[];
> 
> Imo this would better reflect the actual type, i.e. be a function
> decl. If left as an array one, I guess you may want to add const.

I sticked to what x86 has for secondary_startup_64. I can make it

void asm_cpu_bringup_and_idle(void);

Miroslav