linux-kernel - Re: [PATCH -next] pci: add function stub for pci_get_domain_bus_and

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Message-ID: <20171206210209.GN23510@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 6 Dec 2017 15:02:09 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-pci <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Guenter Roeck <linux@...ck-us.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Matthew Minter <matt@...arand.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH -next] pci: add function stub for
 pci_get_domain_bus_and_slot()

[+cc Arnd, Rafael, Thomas, Matthew, Lorenzo]

On Tue, Dec 05, 2017 at 02:39:20PM -0600, Bjorn Helgaas wrote:
> [+cc Sinan]
> 
> On Tue, Nov 28, 2017 at 02:31:21PM -0800, Randy Dunlap wrote:
> > From: Randy Dunlap <rdunlap@...radead.org>
> > 
> > The coretemp driver build fails when CONFIG_PCI is not enabled
> > because it uses a function that does not have a stub for that
> > config case, so add the function stub.
> > 
> > ../drivers/hwmon/coretemp.c: In function 'adjust_tjmax':
> > ../drivers/hwmon/coretemp.c:250:9: error: implicit declaration of function 'pci_get_domain_bus_and_slot' [-Werror=implicit-function-declaration]
> >   struct pci_dev *host_bridge = pci_get_domain_bus_and_slot(0, 0, devfn);
> > ../drivers/hwmon/coretemp.c:250:32: warning: initialization makes pointer from integer without a cast [enabled by default]
> >   struct pci_dev *host_bridge = pci_get_domain_bus_and_slot(0, 0, devfn);
> > 
> > Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> 
> Applied with Guenter's ack to pci/enumeration for v4.16, thanks!
> 
> Apparently no other code calls pci_get_domain_bus_and_slot() when
> CONFIG_PCI isn't enabled.
> 
> 15ab6790f628 ("hwmon: (coretemp) deprecate pci_get_bus_and_slot()") is
> already in linux-next via hwmon-staging.
> 
> The pci tree is merged into next slightly before hwmon-staging, so
> this should be resolved as soon as the 0-day builder builds my
> pci/enumeration branch and I merge it into my next branch.

On Arnd's advice, I moved this to for-linus for v4.15 in case any of
the conversion patches get merged before PCI during the v4.16 merge
window.

> > ---
> >  include/linux/pci.h |    3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > --- linux-next-20171128.orig/include/linux/pci.h
> > +++ linux-next-20171128/include/linux/pci.h
> > @@ -1660,6 +1660,9 @@ static inline struct pci_dev *pci_get_sl
> >  static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus,
> >  						unsigned int devfn)
> >  { return NULL; }
> > +static inline struct pci_dev *pci_get_domain_bus_and_slot(int domain,
> > +					unsigned int bus, unsigned int devfn)
> > +{ return NULL; }
> >  
> >  static inline int pci_domain_nr(struct pci_bus *bus) { return 0; }
> >  static inline struct pci_dev *pci_dev_get(struct pci_dev *dev) { return NULL; }
> > 
> >