linux-kernel - Re: [PATCH] PCI: create builtin_pci_driver to avoid registration boilerplate

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Message-ID: <20151006192719.GD29420@localhost>
Date:	Tue, 6 Oct 2015 14:27:19 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: create builtin_pci_driver to avoid registration
 boilerplate

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.
> 
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: linux-pci@...r.kernel.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

Applied to pci/misc for v4.4, thanks, Paul!

> ---
>  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(...)
> + */
> +#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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