linux-kernel - Re: [PATCH 3/4] pci: move devres code from pci.c to devres.c

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Date:   Tue, 21 Nov 2023 11:17:52 +0100
From:   "Arnd Bergmann" <arnd@...nel.org>
To:     "Philipp Stanner" <pstanner@...hat.com>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Randy Dunlap" <rdunlap@...radead.org>,
        "Jason Gunthorpe" <jgg@...pe.ca>,
        "Eric Auger" <eric.auger@...hat.com>,
        "Kent Overstreet" <kent.overstreet@...il.com>,
        "Niklas Schnelle" <schnelle@...ux.ibm.com>,
        "Neil Brown" <neilb@...e.de>, "John Sanpe" <sanpeqf@...il.com>,
        "Dave Jiang" <dave.jiang@...el.com>,
        "Yury Norov" <yury.norov@...il.com>,
        "Kees Cook" <keescook@...omium.org>,
        "Masami Hiramatsu" <mhiramat@...nel.org>,
        "David Gow" <davidgow@...gle.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "wuqiang.matt" <wuqiang.matt@...edance.com>,
        "Jason Baron" <jbaron@...mai.com>,
        "Ben Dooks" <ben.dooks@...ethink.co.uk>,
        "Danilo Krummrich" <dakr@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 3/4] pci: move devres code from pci.c to devres.c

On Mon, Nov 20, 2023, at 22:59, Philipp Stanner wrote:
> The file pci.c is very large and contains a number of devres-functions.
> These functions should now reside in devres.c
>
> There are a few callers left in pci.c that do devres operations. These
> should be ported in the future. Corresponding TODOs are added by this
> commit.
>
> The reason they are not moved right now in this commit is that pci's
> devres currently implements a sort of "hybrid-mode":
> pci_request_region(), for instance, does not have a corresponding pcim_
> equivalent, yet. Instead, the function can be made managed by previously
> calling pcim_enable_device() (instead of pci_enable_device()). This
> makes it unreasonable to move pci_request_region() to devres.c
> Moving the functions would require changes to pci's API and is,
> therefore, left for future work.
>
> Move as much devres-specific code from pci.c to devres.c as possible.
>
> Suggested-by: Danilo Krummrich <dakr@...hat.com>
> Signed-off-by: Philipp Stanner <pstanner@...hat.com>
> ---
>  drivers/pci/devres.c | 243 +++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/pci.c    | 249 -------------------------------------------
>  drivers/pci/pci.h    |  24 +++++
>  3 files changed, 267 insertions(+), 249 deletions(-)

I had just commented in the other mail that you'd have to move
these functions to devres.c for the file to make sense, but that
I think the existing state is better.

Just to clarify again here: this patch does not seem to improve
anything to me, I'd much prefer leaving it the way it is, and
moving the pcim_iomap family to corresponding drivers/pci/iomap.c. 

     Arnd