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

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Message-ID: <d67285fc-5106-429a-9dd1-747c435282f5@suse.com>
Date: Fri, 11 Oct 2024 12:10:14 +0200
From: Jan Beulich <jbeulich@...e.com>
To: "Chen, Jiqian" <Jiqian.Chen@....com>
Cc: "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
 "linux-kernel@...r.kernel.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 11:33, Chen, Jiqian wrote:
> On 2024/10/11 17:20, Chen, Jiqian wrote:
>> On 2024/10/11 16:54, Jan Beulich wrote:
>>> 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?
>> I'm not sure if other files do this. But for me, it feels a little strange to use "#ifdef CONFIG_XEN_ACPI #else" in apci.h, like self-containment.
>> And "#include apci.h" in pic_stub.c is also wraped with CONFIG_XEN_ACPI.
> OK, I saw other files also do this.
> If you insist, I will make modifications in the next version.

Well, I'm not a maintainer of this code, so I can't very well insist.

Jan