linux-kernel - Re: [PATCH 1/4] lib: move pci

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Date:   Tue, 21 Nov 2023 08:22:29 +0100
From:   "Arnd Bergmann" <arnd@...nel.org>
To:     "kernel test robot" <lkp@...el.com>,
        "Philipp Stanner" <pstanner@...hat.com>,
        "Bjorn Helgaas" <helgaas@...nel.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Randy Dunlap" <rdunlap@...radead.org>,
        "Jason Gunthorpe" <jgg@...pe.ca>,
        "Eric Auger" <eric.auger@...hat.com>,
        "Kent Overstreet" <kmo@...erainc.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:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        "Linux Memory Management List" <linux-mm@...ck.org>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/4] lib: move pci_iomap.c to drivers/pci/

On Tue, Nov 21, 2023, at 07:48, kernel test robot wrote:
>
> If you fix the issue in a separate patch/commit (i.e. not just a new 
> version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: 
> https://lore.kernel.org/oe-kbuild-all/202311211441.4LgOiu32-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>    drivers/pci/iomap.c:27:15: error: redefinition of 'pci_iomap_range'
>    void __iomem *pci_iomap_range(struct pci_dev *dev,
>                  ^
>    include/asm-generic/pci_iomap.h:44:29: note: previous definition is here
>    static inline void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
>                                ^
>>> drivers/pci/iomap.c:43:10: error: call to undeclared function '__pci_ioport_map'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>                    return __pci_ioport_map(dev, start, len);

>From what I can tell looking at the header, I think we can
just remove the "#elif defined(CONFIG_GENERIC_PCI_IOMAP)"
bit entirely, as it no longer serves the purpose it originally
had.

It also looks like s390 is the only architecture that actually
uses a custom implementation of pci_iomap*(), and this already has

#define pci_iomap pci_iomap
#define pci_iomap_range pci_iomap_range
#define pci_iounmap pci_iounmap
#define pci_iomap_wc pci_iomap_wc
#define pci_iomap_wc_range pci_iomap_wc_range

so the entire CONFIG_GENERIC_PCI_IOMAP symbol can probably
be replaced with individual checks here, using CONFIG_PCI
as the conditional in the Makefile.

    Arnd