linux-kernel - Re: [PATCH v18 6/6] ARM: socfpga: fpga bridge driver support

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Message-ID: <20160809160039.GX29630@windriver.com>
Date:	Tue, 9 Aug 2016 12:00:39 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Moritz Fischer <moritz.fischer@...us.com>
CC:	atull <atull@...nsource.altera.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Devicetree List <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Tull <delicious.quinoa@...il.com>,
	Matthew Gerlach <mgerlach@...era.com>
Subject: Re: [PATCH v18 6/6] ARM: socfpga: fpga bridge driver support

[Re: [PATCH v18 6/6] ARM: socfpga: fpga bridge driver support] On 08/08/2016 (Mon 13:44) Moritz Fischer wrote:

> Hi Alan,
> 
> On Mon, Aug 8, 2016 at 12:18 PM, atull <atull@...nsource.altera.com> wrote:
> 
> >> Please don't use module.h in drivers controlled by a bool
> >> Kconfig setting.
> >>
> >> THanks,
> >> Paul.
> >>
> >
> > Thanks for the feedback.  Can you provide an example of what you
> > would consider to be proper usage in the kernel?
> 
> 
> I think Paul is suggesting to use
> 
> static int __init alt_fpga_bridge_init(void)
> {
>         platform_driver_register(&alt_fpga_bridge_driver);
> }
> 
> device_initcall(alt_fpga_bridge_init);
> 
> or better:
> 
> builtin_platform_driver(&alt_fpga_bridge_driver);
> 
> Like for example in: drivers/cpuidle/cpuidle-mvebu-v7.c

Yes, pretty much that -- if you have a bool Kconfig, you should be using
builtin registration functions, and have no need for module.h or
anything MODULE_<xyz> or any module_init/module_exit calls.

An empty file containing nothing but #include <linux/module.h> will
cause cpp to emit about 750k of goop, so we really should only be using
it for drivers that are genuinely modular; i.e. tristate Kconfig.

Thanks,
Paul.
--

> 
> Cheers,
> 
> Moritz