Messages in this thread | | | Date | Tue, 15 Sep 2015 11:46:42 -0500 | From | Bjorn Helgaas <> | Subject | Re: [PATCH] PCI: create builtin_pci_driver to avoid registration boilerplate |
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Hi Paul,
On Tue, Aug 25, 2015 at 08:25:37PM -0400, Paul Gortmaker wrote: > In commit f309d4443130bf814e991f836e919dca22df37ae ("platform_device: > better support builtin boilerplate avoidance") we introduced the > builtin_driver macro. > > Here we use that support and extend it to PCI driver registration, > so where a driver is clearly non-modular and builtin-only, we can > register it in a similar fashion. And existing code that is clearly > non-modular can be updated with the simple mapping of > > module_pci_driver(...) ---> builtin_pci_driver(...) > > We've essentially cloned the former to make the latter, and taken > out the remove/module_exit parts since those never get used in a > non-modular build of the code.
Do you have any estimate of how many potential users of this there are? I took a quick look at users of module_pci_driver() (I see almost 300 of them in v4.3-rc1), and most of them look like legitimate modules. But the comment mentions replacing device_initcall() as well, so maybe there are more there?
If only a couple would be converted to builtin_pci_driver(), I'm not sure it's worth it, because it does add more things to look at (builtin_pci_driver() in addition to module_pci_driver()).
> Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-pci@vger.kernel.org > Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> > --- > include/linux/pci.h | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 88bee285b93d..8da2758e7d0e 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1187,6 +1187,17 @@ void pci_unregister_driver(struct pci_driver *dev); > module_driver(__pci_driver, pci_register_driver, \ > pci_unregister_driver) > > +/** > + * builtin_pci_driver() - Helper macro for registering a PCI driver > + * @__pci_driver: pci_driver struct > + * > + * Helper macro for PCI drivers which do not do anything special in their > + * init code. This eliminates a lot of boilerplate. Each driver may only > + * use this macro once, and calling it replaces device_initcall(...)
The builtin_platform_driver() patches I see are single-line patches, so they don't look like they remove a *lot* of boilerplate.
Bjorn
> + */ > +#define builtin_pci_driver(__pci_driver) \ > + builtin_driver(__pci_driver, pci_register_driver) > + > struct pci_driver *pci_dev_driver(const struct pci_dev *dev); > int pci_add_dynid(struct pci_driver *drv, > unsigned int vendor, unsigned int device, > -- > 2.5.0 >
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