linux-kernel - Re: [PATCH v2 2/4] lib: move pci-specific devres code to drivers/pci/

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Date:   Fri, 01 Dec 2023 20:00:03 +0100
From:   Philipp Stanner <pstanner@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Dave Jiang <dave.jiang@...el.com>,
        Uladzislau Koshchanka <koshchanka@...il.com>,
        Neil Brown <neilb@...e.de>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        John Sanpe <sanpeqf@...il.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        David Gow <davidgow@...gle.com>,
        Yury Norov <yury.norov@...il.com>,
        "wuqiang.matt" <wuqiang.matt@...edance.com>,
        Jason Baron <jbaron@...mai.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        Danilo Krummrich <dakr@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] lib: move pci-specific devres code to
 drivers/pci/

On Fri, 2023-12-01 at 15:44 +0100, Arnd Bergmann wrote:
> On Fri, Dec 1, 2023, at 13:16, Philipp Stanner wrote:
> > The pcim_*() functions in lib/devres.c are guarded by an #ifdef
> > CONFIG_PCI and, thus, don't belong to this file. They are only ever
> > used
> > for pci and are not generic infrastructure.
> > 
> > Move all pcim_*() functions in lib/devres.c to
> > drivers/pci/devres.c.
> > Adjust the Makefile.
> > 
> > Suggested-by: Danilo Krummrich <dakr@...hat.com>
> > Signed-off-by: Philipp Stanner <pstanner@...hat.com>
> > ---
> >  drivers/pci/Makefile |   2 +-
> >  drivers/pci/devres.c | 207
> > ++++++++++++++++++++++++++++++++++++++++++
> >  lib/devres.c         | 208 +--------------------------------------
> > ----
> 
> I still think this should go into drivers/pci/pci_iomap.c along
> with the other functions.

I understand where you're coming from, but the technical reason I'm
doing it this way is the same topic as in patch №1:

@@ -14,6 +14,7 @@ ifdef CONFIG_PCI
 obj-$(CONFIG_PROC_FS)		+= proc.o
 obj-$(CONFIG_SYSFS)		+= slot.o
 obj-$(CONFIG_ACPI)		+= pci-acpi.o
+obj-$(CONFIG_GENERIC_PCI_IOMAP) += iomap.o
 endif


As you pointed out very correctly, I removed the #ifdef PCI in the
iomap.c functions, which would result in build failure, because the
file has to be made empty if GENERIC_PCI_IOMAP is selected and PCI is
not

The devres functions have different compile rules than the iomap
functions have.

I would dislike it very much to need yet another preprocessor
instruction, especially if we're talking about #ifdef PCI within the
very PCI driver.

P.

> 
>      Arnd
>