linux-kernel - Re: [PATCH 01/14] x86/cpu: Move intel-family to arch-independent headers

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Date:   Wed, 14 Jul 2021 16:54:47 +0000
From:   "Williams, Dan J" <dan.j.williams@...el.com>
To:     "Winiarska, Iwona" <iwona.winiarska@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
CC:     "corbet@....net" <corbet@....net>,
        "jae.hyun.yoo@...ux.intel.com" <jae.hyun.yoo@...ux.intel.com>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "andrew@...id.au" <andrew@...id.au>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "yazen.ghannam@....com" <yazen.ghannam@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "joel@....id.au" <joel@....id.au>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "bp@...en8.de" <bp@...en8.de>
Subject: Re: [PATCH 01/14] x86/cpu: Move intel-family to arch-independent
 headers

On Tue, 2021-07-13 at 00:04 +0200, Iwona Winiarska wrote:
> Baseboard management controllers (BMC) often run Linux but are usually
> implemented with non-X86 processors. They can use PECI to access package
> config space (PCS) registers on the host CPU and since some information,
> e.g. figuring out the core count, can be obtained using different
> registers on different CPU generations, they need to decode the family
> and model.
> 
> Move the data from arch/x86/include/asm/intel-family.h into a new file
> include/linux/x86/intel-family.h so that it can be used by other
> architectures.

At least it would make the diffstat smaller to allow for rename
detection when the old file is deleted in the same patch:

 MAINTAINERS                                                | 1 +
 {arch/x86/include/asm => include/linux/x86}/intel-family.h | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

...one thing people have done in the past is include a conversion
script in the changelog that produced the diff. That way if a
maintainer wants to be sure to catch any new usage of the header at
the old location they just run the script.

I am not aware of x86 maintainer preference here. Either way you decide
to go you can add:

Reviewed-by: Dan Williams <dan.j.williams@...el.com>