linux-kernel - Re: [PATCH v5 2/2] PCI: Implement custom llseek for sysfs resource entries

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Date:   Tue, 29 Aug 2023 15:26:13 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Valentin Sinitsyn <valesini@...dex-team.ru>
Cc:     kernel test robot <lkp@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, oe-kbuild-all@...ts.linux.dev,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] PCI: Implement custom llseek for sysfs resource
 entries

On Tue, Aug 29, 2023 at 03:02:29PM -0500, Bjorn Helgaas wrote:
> On Mon, Aug 28, 2023 at 12:22:54PM +0500, Valentin Sinitsyn wrote:
> > On 25.08.2023 19:10, kernel test robot wrote:
> > > Hi Valentine,
> > > 
> > > kernel test robot noticed the following build warnings:
> > > 
> > [..]
> > > All warnings (new ones prefixed by >>):
> > > 
> > >     drivers/pci/pci-sysfs.c:1268:12: warning: no previous prototype for 'pci_create_resource_files' [-Wmissing-prototypes]
> > >      1268 | int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
> > >           |            ^~~~~~~~~~~~~~~~~~~~~~~~~
> > >     drivers/pci/pci-sysfs.c:1269:13: warning: no previous prototype for 'pci_remove_resource_files' [-Wmissing-prototypes]
> > >      1269 | void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
> > >           |             ^~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > drivers/pci/pci-sysfs.c:838:15: warning: 'pci_llseek_resource' defined but not used [-Wunused-function]
> > >       838 | static loff_t pci_llseek_resource(struct file *filep,
> > >           |               ^~~~~~~~~~~~~~~~~~~
> > I'm not sure if I should do anything about it: arc doesn't HAVE_* anything
> > PCI-related, and pci-sysfs doesn't seem to be written with this case in
> > mind. Guarding pci_llseek_resource() with an #ifdef HAVE_AT_LEAST_SOMETHING
> > is trivial, but it feels more like a patch to silence a bot than a proper
> > fix.
> 
> Looks like it will require some untangling to figure out a nice fix,
> but I think you *do* need to do something about it because I don't
> want to add build errors on any arch.

P.S. This patch:
https://lore.kernel.org/r/20230810141947.1236730-5-arnd@kernel.org is
queued up for v6.6-rc1 and should help with the first two warnings.

Bjorn