linux-kernel - Re: [PATCH] xen: xen_debug_interrupt prototype to global header

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Date:   Wed, 17 May 2023 12:41:06 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
cc:     Juergen Gross <jgross@...e.com>, Arnd Bergmann <arnd@...db.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Jan Beulich <jbeulich@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen: xen_debug_interrupt prototype to global header

On Wed, 17 May 2023, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The xen_debug_interrupt() function is only called on x86, which has a
> prototype in an architecture specific header, but the definition also
> exists on others, where the lack of a prototype causes a W=1 warning:
> 
> drivers/xen/events/events_2l.c:264:13: error: no previous prototype for 'xen_debug_interrupt' [-Werror=missing-prototypes]
> 
> Move the prototype into a global header instead to avoid this warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>


> ---
>  arch/x86/xen/xen-ops.h | 2 --
>  include/xen/events.h   | 3 +++
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
> index 84a35ff1e0c9..0f71ee3fe86b 100644
> --- a/arch/x86/xen/xen-ops.h
> +++ b/arch/x86/xen/xen-ops.h
> @@ -72,8 +72,6 @@ void xen_restore_time_memory_area(void);
>  void xen_init_time_ops(void);
>  void xen_hvm_init_time_ops(void);
>  
> -irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
> -
>  bool xen_vcpu_stolen(int vcpu);
>  
>  void xen_vcpu_setup(int cpu);
> diff --git a/include/xen/events.h b/include/xen/events.h
> index 44c2855c76d1..ac1281c5ead6 100644
> --- a/include/xen/events.h
> +++ b/include/xen/events.h
> @@ -138,4 +138,7 @@ int xen_test_irq_shared(int irq);
>  
>  /* initialize Xen IRQ subsystem */
>  void xen_init_IRQ(void);
> +
> +irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
> +
>  #endif	/* _XEN_EVENTS_H */
> -- 
> 2.39.2
>