linux-kernel - Re: [PATCH] irq: don't put module.h into irq.h for tracking irqgen modules.

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Date:	Tue, 18 Oct 2011 14:44:18 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
CC:	<tglx@...utronix.de>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] irq: don't put module.h into irq.h for tracking irqgen
 modules.

On 11-10-18 01:43 PM, Sebastian Andrzej Siewior wrote:
> On Fri, Sep 30, 2011 at 09:53:57PM -0400, Paul Gortmaker wrote:
>> Recent commit "irq: Track the owner of irq descriptor" in
>> commit ID b6873807a7143b7 placed module.h into linux/irq.h
>> but we are trying to limit module.h inclusion to just C files
>> that really need it, due to its size and number of children
>> includes.  This targets just reversing that include.
> 
> Sorry for that. This is for "not to re-compile the whole tree once a tiny
> header file has changes" right?

Correct.

> 
>> Add in the basic "struct module" since that is all we really need
>> to ensure things compile.  In theory, b687380 should have added the
>> module.h include to the irqdesc.h header as well, but the implicit
>> module.h everywhere presence masked this from showing up.  So give
>> it the "struct module" as well.
>>
>> As for the C files, irqdesc.c is only using THIS_MODULE, so it
>> does not need module.h - give it export.h instead.  The C file
> 
> just tried to compile this ontop of the tip tree and it ended with:
> |kernel/irq/irqdesc.c:12:26: fatal error: linux/export.h: No such file or directory
> 
> I guess your tree provides that file.

Correct.  You need my tree, or the most recent linux-next tree (which
is better, since we are really interested in how my tree interacts
with all the other pending trees.)

> 
>> irq/manage.c is now (as of b687380) using try_module_get and
>> module_put and so it needs module.h (which it already has).
>>
>> Also convert the irq_alloc_descs variants to macros, since all
>> they really do is is call the __irq_alloc_descs primitive.
>> This avoids including export.h and no debug info is lost.
> 
> macros, I see. THIS_MODULE is quite simple. What about moving this part from
> module.h which is hidden behind ifdef MODULE and make it avaiable as a separate
> headerfile with no children?

Already done.  THIS_MODULE, because of its presence everywhere
in non modular code is also in the export.h file.

Paul.

> 
> Sebastian
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