linux-kernel - Re: [PATCH v3 2/3] ahci: Use macro PCI_DEVICE_ID_AMD_HUDSON2_SATA

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Date:   Fri, 31 Dec 2021 09:50:27 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] ahci: Use macro PCI_DEVICE_ID_AMD_HUDSON2_SATA_IDE

On 12/30/21 20:01, Paul Menzel wrote:
> Dear Damien,
> 
> 
> Am 30.12.21 um 03:13 schrieb Damien Le Moal:
>> On 12/30/21 01:11, Paul Menzel wrote:
>>> Use the defined macro from `include/linux/pci_ids.h`.
>>>
>>> Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
>>> ---
>>>   drivers/ata/ahci.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>>> index 1e1167e725a4..6a2432e4adda 100644
>>> --- a/drivers/ata/ahci.c
>>> +++ b/drivers/ata/ahci.c
>>> @@ -436,7 +436,7 @@ static const struct pci_device_id ahci_pci_tbl[] = {
>>>   		.class_mask = 0xffffff,
>>>   		board_ahci_al },
>>>   	/* AMD */
>>> -	{ PCI_VDEVICE(AMD, 0x7800), board_ahci }, /* AMD Hudson-2 */
>>> +	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_HUDSON2_SATA_IDE), board_ahci }, >
>> That breaks the style of the declarations here... And since
>> PCI_DEVICE_ID_AMD_HUDSON2_SATA_IDE is used only in drivers/pci/quirks.c,
>> I do not really see the point of this change.
> 
> 1.  It makes the comment superfluous.
> 2.  `git grep 0x7800` in the Linux source returns 1034 hits, so getting 
> the macro name from the header `pci_ids.h` and then grepping for that is 
> more straight forward.
> 
> I agree, that it breaks the style, and, if you agree, I could try to fix 
> up the whole file.

Arg, please no ! That would need defining a ton of PCI IDs for using
them only here. Let's not do that.

See Sergey and Hannes comment too. Let's keep the current style. Note
that with this change, AMD_HUDSON2_SATA_IDE PCI ID would be used both
here and in drivers/pci/quirks.c, so 2 places. But given that the ID
here is only for the table entry and used nowhere else, using the
numeral is better to preserve the style. So let's drop this patch.

> 
>>>   	{ PCI_VDEVICE(AMD, 0x7900), board_ahci }, /* AMD CZ */
>>>   	{ PCI_VDEVICE(AMD, 0x7901), board_ahci_mobile }, /* AMD Green Sardine */
>>>   	/* AMD is using RAID class only for ahci controllers */
> 
> 
> Kind regards,
> 
> Paul


-- 
Damien Le Moal
Western Digital Research