linux-kernel - Re: [PATCH v3] xen: Remove dependency between pciback and privcmd

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Message-ID: <318bd8a4-a349-4e7b-8653-6995d5f9f125@suse.com>
Date: Fri, 11 Oct 2024 10:54:39 +0200
From: Jan Beulich <jbeulich@...e.com>
To: Jiqian Chen <Jiqian.Chen@....com>
Cc: xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
 Marek Marczykowski-Górecki
 <marmarek@...isiblethingslab.com>, Juergen Gross <jgross@...e.com>,
 Stefano Stabellini <sstabellini@...nel.org>,
 Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: Re: [PATCH v3] xen: Remove dependency between pciback and privcmd

On 11.10.2024 05:42, Jiqian Chen wrote:
> @@ -1757,11 +1756,19 @@ static int __init xen_pcibk_init(void)
>  		bus_register_notifier(&pci_bus_type, &pci_stub_nb);
>  #endif
>  
> +#ifdef CONFIG_XEN_ACPI
> +	xen_acpi_register_get_gsi_func(pcistub_get_gsi_from_sbdf);
> +#endif
> +
>  	return err;
>  }
>  
>  static void __exit xen_pcibk_cleanup(void)
>  {
> +#ifdef CONFIG_XEN_ACPI
> +	xen_acpi_register_get_gsi_func(NULL);
> +#endif

Just wondering - instead of these two #ifdef-s, ...

> --- a/include/xen/acpi.h
> +++ b/include/xen/acpi.h
> @@ -91,13 +91,9 @@ static inline int xen_acpi_get_gsi_info(struct pci_dev *dev,
>  }
>  #endif
>  
> -#ifdef CONFIG_XEN_PCI_STUB
> -int pcistub_get_gsi_from_sbdf(unsigned int sbdf);
> -#else
> -static inline int pcistub_get_gsi_from_sbdf(unsigned int sbdf)
> -{
> -	return -1;
> -}
> -#endif
> +typedef int (*get_gsi_from_sbdf_t)(u32 sbdf);
> +
> +void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func);
> +int xen_acpi_get_gsi_from_sbdf(u32 sbdf);

... wouldn't a static inline stub (for the !XEN_ACPI case) aid overall readability?

Jan