linux-kernel - Re: [PATCH 4/4] drivers: xen: Move prototype declaration to header file include/xen/xen-ops.h from arch/x86/xen/xen-ops.h

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Date:	Mon, 10 Feb 2014 13:26:53 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Rashika Kheria <rashika.kheria@...il.com>
CC:	<linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <josh@...htriplett.org>
Subject: Re: [PATCH 4/4] drivers: xen: Move prototype declaration to header
 file include/xen/xen-ops.h from arch/x86/xen/xen-ops.h

On Sun, 9 Feb 2014, Rashika Kheria wrote:
> Move prototype declaration to header file include/xen/xen-ops.h from
> arch/x86/xen/xen-ops.h because it is used by more than one file. Also,
> remove else condition from xen/events/events_base.c to eliminate
> conflicting definitions when CONFIG_XEN_PVHVM is not defined.
> 
> This eliminates the following warning in xen/events/events_base.c:
> drivers/xen/events/events_base.c:1640:6: warning: no previous prototype for ‘xen_callback_vector’ [-Wmissing-prototypes]
> 
> Signed-off-by: Rashika Kheria <rashika.kheria@...il.com>

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>


>  arch/x86/xen/xen-ops.h           |    1 -
>  drivers/xen/events/events_base.c |    2 --
>  include/xen/xen-ops.h            |    7 +++++++
>  3 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
> index e5edc7f..aa8a979 100644
> --- a/arch/x86/xen/xen-ops.h
> +++ b/arch/x86/xen/xen-ops.h
> @@ -39,7 +39,6 @@ void xen_enable_sysenter(void);
>  void xen_enable_syscall(void);
>  void xen_vcpu_restore(void);
>  
> -void xen_callback_vector(void);
>  void xen_hvm_init_shared_info(void);
>  void xen_unplug_emulated_devices(void);
>  
> diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
> index 4672e00..5466543 100644
> --- a/drivers/xen/events/events_base.c
> +++ b/drivers/xen/events/events_base.c
> @@ -1656,8 +1656,6 @@ void xen_callback_vector(void)
>  					xen_hvm_callback_vector);
>  	}
>  }
> -#else
> -void xen_callback_vector(void) {}
>  #endif
>  
>  #undef MODULE_PARAM_PREFIX
> diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
> index 9a86337..cdea45b 100644
> --- a/include/xen/xen-ops.h
> +++ b/include/xen/xen-ops.h
> @@ -38,4 +38,11 @@ int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
>  bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
>  
>  irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
> +
> +#ifdef CONFIG_XEN_PVHVM
> +void xen_callback_vector(void);
> +#else
> +static inline void xen_callback_vector(void) {}
> +#endif
> +
>  #endif /* INCLUDE_XEN_OPS_H */
> -- 
> 1.7.9.5
>