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Date:   Tue, 21 Nov 2023 11:10:41 +0100
From:   "Arnd Bergmann" <arnd@kernel.org>
To:     "Philipp Stanner" <pstanner@redhat.com>,
        "Bjorn Helgaas" <bhelgaas@google.com>,
        "Andrew Morton" <akpm@linux-foundation.org>,
        "Randy Dunlap" <rdunlap@infradead.org>,
        "Jason Gunthorpe" <jgg@ziepe.ca>,
        "Eric Auger" <eric.auger@redhat.com>,
        "Kent Overstreet" <kent.overstreet@gmail.com>,
        "Niklas Schnelle" <schnelle@linux.ibm.com>,
        "Neil Brown" <neilb@suse.de>, "John Sanpe" <sanpeqf@gmail.com>,
        "Dave Jiang" <dave.jiang@intel.com>,
        "Yury Norov" <yury.norov@gmail.com>,
        "Kees Cook" <keescook@chromium.org>,
        "Masami Hiramatsu" <mhiramat@kernel.org>,
        "David Gow" <davidgow@google.com>,
        "Herbert Xu" <herbert@gondor.apana.org.au>,
        "Thomas Gleixner" <tglx@linutronix.de>,
        "wuqiang.matt" <wuqiang.matt@bytedance.com>,
        "Jason Baron" <jbaron@akamai.com>,
        "Ben Dooks" <ben.dooks@codethink.co.uk>,
        "Danilo Krummrich" <dakr@redhat.com>
Cc:     linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org
Subject: Re: [PATCH 2/4] lib: move pci-specific devres code to drivers/pci/
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On Tue, Nov 21, 2023, at 09:00, Philipp Stanner wrote:
> On Tue, 2023-11-21 at 08:29 +0100, Arnd Bergmann wrote:
>> On Mon, Nov 20, 2023, at 22:59, Philipp Stanner wrote:
>> 
>> Since you are moving the pci_iomap() code into drivers/pci/ already,
>> I'd suggest merging this one into the same file and keep the two
>> halves of this interface together.
>
>
> I'd argue that they are as much together as they were before:
>
> Previously:
>  * PCI-IOMAP-code in folder lib/ in its own file (pci_iomap.c)
>  * PCI-Devres-code in folder lib/ in a distinct file (devres.c)
>
> Now:
>  * PCI-IOMAP-code in folder drivers/pci/ in its own file (iomap.c)
>  * PCI-Devres-code in folder drivers/pci/ in its own file (devres.c)
>
> Or am I misunderstanding something?

They are indeed closer together now, just not in the same file.

Looking across subsystems at the output of

git grep -l EXPORT.*devm

I see that 10 out of 182 files have split the devres functions
into a separate file, while the others just keep the devm_*
function in the same place as the normal one. Since you never
have one of these files without the other, and they do
almost the exact same thing, a single file is the simpler
option.

Note that there are also three pcim_*() functions in
drivers/pci/pci.c. I think that is the correct place for
them, but if you wanted to split out pci devres functions
into a separate file, they would now also have to go
into drivers/pci/devres.c.

     Arnd