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From: Dan Williams <dan.j.williams@intel.com>
To: "Winiarska, Iwona" <iwona.winiarska@intel.com>
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Subject: Re: [PATCH 01/14] x86/cpu: Move intel-family to arch-independent headers
Date: Thu, 15 Jul 2021 11:13:59 -0700	[thread overview]
Message-ID: <CAPcyv4hxsjKjLkEgGuG6tHvYxUa69315OvhYRORvCtXv6vu2nw@mail.gmail.com> (raw)
In-Reply-To: <218ef97a68491e88d8012799385ee244544a157a.camel@intel.com>

On Thu, Jul 15, 2021 at 9:47 AM Winiarska, Iwona
<iwona.winiarska@intel.com> wrote:
>
> On Wed, 2021-07-14 at 16:54 +0000, Williams, Dan J wrote:
> > 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.
>
> You mean like a simple s#asm/intel-family.h#linux/x86/intel-family.h#g
> ?
> Operating on kernel tree? Or individual patches?

Whole kernel tree, something like this patch is a good example:

58c1a35cd522 btrfs: convert kmap to kmap_local_page, simple cases

In this one, Ira generated a patch from a script, and the maintainer
could re-run it if new development added more of the "old way" before
applying Ira's patch.

> Is including "old" header in new code that big of a deal?

I was proposing ripping the band-aid off and deleting the old header,
in which case it would cause compile breakage if someone added a new
instance of the old include before the conversion patch was applied.

> I guess it
> could break grepability (looking for users of the header, now that it
> can be pulled from two different places).
> It would be worse if someone decided to add new content to old header,
> but this should be easier to catch during review.

Having 2 potential places for the same definition causes a small
ongoing maintenance / review burden, so I vote moving the file rather
than leaving a place holder, but it's ultimately an x86 maintainer
call.

  reply	other threads:[~2021-07-15 18:14 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12 22:04 [PATCH 00/14] Introduce PECI subsystem Iwona Winiarska
2021-07-12 22:04 ` [PATCH 01/14] x86/cpu: Move intel-family to arch-independent headers Iwona Winiarska
2021-07-14 16:54   ` Williams, Dan J
2021-07-15 16:47     ` Winiarska, Iwona
2021-07-15 18:13       ` Dan Williams [this message]
2021-07-15 18:29         ` Luck, Tony
2021-07-12 22:04 ` [PATCH 02/14] x86/cpu: Extract cpuid helpers to arch-independent Iwona Winiarska
2021-07-14 16:58   ` Williams, Dan J
2021-07-15 16:51     ` Winiarska, Iwona
2021-07-15 16:58       ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 03/14] dt-bindings: Add generic bindings for PECI Iwona Winiarska
2021-07-12 22:04 ` [PATCH 04/14] dt-bindings: Add bindings for peci-aspeed Iwona Winiarska
2021-07-15 16:28   ` Rob Herring
2021-07-16 21:22     ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 05/14] ARM: dts: aspeed: Add PECI controller nodes Iwona Winiarska
2021-07-12 22:04 ` [PATCH 06/14] peci: Add core infrastructure Iwona Winiarska
2021-07-14 17:19   ` Williams, Dan J
2021-07-16 21:08     ` Winiarska, Iwona
2021-07-16 21:50       ` Dan Williams
2021-07-17  6:12         ` gregkh
2021-07-17 20:54           ` Dan Williams
2021-07-12 22:04 ` [PATCH 07/14] peci: Add peci-aspeed controller driver Iwona Winiarska
2021-07-13  5:02   ` Randy Dunlap
2021-07-15 16:42     ` Winiarska, Iwona
2021-07-14 17:39   ` Williams, Dan J
2021-07-16 21:17     ` Winiarska, Iwona
2021-07-27  8:49   ` Zev Weiss
2021-07-29 14:03     ` Winiarska, Iwona
2021-07-29 18:15       ` Zev Weiss
2021-07-12 22:04 ` [PATCH 08/14] peci: Add device detection Iwona Winiarska
2021-07-14 21:05   ` Williams, Dan J
2021-07-16 21:20     ` Winiarska, Iwona
2021-07-27 17:49   ` Zev Weiss
2021-07-29 18:55     ` Winiarska, Iwona
2021-07-29 20:50       ` Zev Weiss
2021-07-30 20:10         ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 09/14] peci: Add support for PECI device drivers Iwona Winiarska
2021-07-27 20:10   ` Zev Weiss
2021-07-27 21:23     ` Guenter Roeck
2021-07-29 21:17     ` Winiarska, Iwona
2021-07-29 23:22       ` Zev Weiss
2021-07-30 20:13         ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 10/14] peci: Add peci-cpu driver Iwona Winiarska
2021-07-27 11:16   ` David Müller (ELSOFT AG)
2021-07-30 20:14     ` Winiarska, Iwona
2021-07-27 21:33   ` Zev Weiss
2021-07-30 21:21     ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 11/14] hwmon: peci: Add cputemp driver Iwona Winiarska
2021-07-15 17:45   ` Guenter Roeck
2021-07-19 20:12     ` Winiarska, Iwona
2021-07-19 20:35       ` Guenter Roeck
2021-07-27  7:06   ` Zev Weiss
2021-07-30 21:51     ` Winiarska, Iwona
2021-07-30 22:04       ` Guenter Roeck
2021-07-12 22:04 ` [PATCH 12/14] hwmon: peci: Add dimmtemp driver Iwona Winiarska
2021-07-15 17:56   ` Guenter Roeck
2021-07-19 20:31     ` Winiarska, Iwona
2021-07-19 20:36       ` Guenter Roeck
2021-07-26 22:08   ` Zev Weiss
2021-07-30 22:48     ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 13/14] docs: hwmon: Document PECI drivers Iwona Winiarska
2021-07-27 22:58   ` Zev Weiss
2021-07-28  0:49     ` Guenter Roeck
2021-08-02 11:39       ` Winiarska, Iwona
2021-08-02 11:37     ` Winiarska, Iwona
2021-08-04 17:52       ` Zev Weiss
2021-08-04 18:05         ` Guenter Roeck
2021-08-05 21:42           ` Winiarska, Iwona
2021-07-12 22:04 ` [PATCH 14/14] docs: Add PECI documentation Iwona Winiarska
2021-07-14 16:51 ` [PATCH 00/14] Introduce PECI subsystem Williams, Dan J
2021-07-15 17:33   ` Winiarska, Iwona
2021-07-15 19:34     ` Dan Williams

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