linux-kernel - Re: [PATCH 2/3] usb: host: pci: introduce PCI vendor ID for Netlogic

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Message-ID: <377fb9d5-1cc9-7ab8-c965-2fb0a4dc20f3@skidata.com>
Date:   Wed, 14 Mar 2018 16:44:38 +0100
From:   Richard Leitner <richard.leitner@...data.com>
To:     Oliver Neukum <oneukum@...e.com>, Richard Leitner <dev@...l1n.net>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-usb@...r.kernel.org>
CC:     <bhelgaas@...gle.com>, <mathias.nyman@...el.com>,
        <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/3] usb: host: pci: introduce PCI vendor ID for Netlogic


On 03/14/2018 04:27 PM, Oliver Neukum wrote:
> Am Mittwoch, den 14.03.2018, 14:31 +0100 schrieb Richard Leitner:
>> Hi Oliver,
>> thank you for your feedback!
>>
>> On 03/14/2018 01:17 PM, Oliver Neukum wrote:
>>> Am Mittwoch, den 14.03.2018, 11:29 +0100 schrieb Richard Leitner:
>>>> From: Richard Leitner <richard.leitner@...data.com>
>>>>
>>>> Replace the hardcoded PCI vendor ID of Netlogic with a definition in
>>>> pci_ids.h
>>>
>>> Hi,
>>>
>>> in general, why?
>>> Does this patch generate any benefit for any developer
>>> reading the source? I don't see it. Does it cause an
>>> issue for anybody who has a log file with the nummerical
>>> ID and needs to grep for it? Yes it does.
>>
>> I'll send a v2 where I also use this definition in 
>> arch/mips/netlogic/xlp/ instead of PCI_VENDOR_NETLOGIC from
>> arch/mips/include/asm/netlogic/xlp-hal/iomap.h.
>>
>> Therefore it will remove this definition from the iomap.h
>> and move it to pci_ids.h
>>
>> This will IMHO be a clear benefit as it removes a redundant
>> definition.
> 
> Well, but it does not. Removing a redundant definition is a clear
> benefit. But you are not removing a definition. You are introducing
> a preprocessor constant. Why?
> What is its benefit?

AFAIK pci_ids.h collects PCI vendor and device IDs in one single 
point. As the PCI vendor ID of Netlogic is used in multiple files
IMHO it would be a good idea to add it to pci_ids.h and furthermore
remove it from arch/mips/include/asm/netlogic/xlp-hal/iomap.h (where
it's currently defined).

Or am I getting things wrong?

regards;richard.l