linux-kernel - Re: [PATCH (revised)] device_schedule

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Date:	Tue, 10 Apr 2007 12:46:11 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Neil Brown <neilb@...e.de>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>
Subject: Re: [PATCH (revised)] device_schedule_callback needs a module
 reference

On Tue, 10 Apr 2007, Cornelia Huck wrote:

> Whoops:
> 
> In file included from include/linux/interrupt.h:15,
>                  from include/asm/hardirq.h:18,
>                  from include/linux/hardirq.h:7,
>                  from include/asm-generic/local.h:5,
>                  from include/asm/local.h:1,
>                  from include/linux/module.h:19,
>                  from arch/s390/kernel/time.c:16:
> include/linux/device.h: In function 'device_schedule_callback':
> include/linux/device.h:374: error: 'THIS_MODULE' undeclared (first use in this function)
> include/linux/device.h:374: error: (Each undeclared identifier is reported only once
> include/linux/device.h:374: error: for each function it appears in.)
> 
> Maybe better move the implementation of device_schedule_callback() to
> drivers/base/core.c? (Though I'm not sure why
> include/asm-s390/hardirq.h includes linux/interrupt.h, and e.g.
> include/asm-i386/hardirq.h doesn't.)

I don't think moving device_schedule_callback() is the answer.  For one 
thing, the implementation _has_ to be compiled in the calling module so 
that THIS_MODULE will have the correct value.  If it were compiled in 
drivers/base/core.c then it wouldn't refer to the caller's module.

The real problem is bad nesting of #includes.  Maybe changing 
include/asm-s390/hardirq.h not to include linux/interrupt.h will be 
feasible.

Or perhaps it would be better to move the definition of THIS_MODULE in
linux/module.h up before all the #include lines, since it seems reasonable
that a file indirectly included by module.h might need to use THIS_MODULE.

Alan Stern

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