linux-kernel - Re: [patch 17/18] net/rfkill/rfkill-input.c needs <linux/sched.h>

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Message-ID: <20081015131205.GD10917@cs181140183.pp.htv.fi>
Date:	Wed, 15 Oct 2008 16:12:05 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 17/18] net/rfkill/rfkill-input.c needs <linux/sched.h>

On Wed, Oct 15, 2008 at 12:10:18AM -0300, Henrique de Moraes Holschuh wrote:
> On Tue, 14 Oct 2008, Geert Uytterhoeven wrote:
> > Unfortunately that's not possible, due to Include Hell(tm).
> > Therefore, including <linux/sched.h> is the way this has been fixed in
> > the past.
> 
> I see.  Well, when doing this I'd suggest adding a comment, otherwise the
> include could end up getting removed sooner or later without anyone asking
> linux-m68k first (I seriously douby anyone will do git blame to find out why
> an #include line exists before removing it).
> 
> Something like:
> #include <sched.h> /* m68k needs task_struct for <whatever> */

Such comments in the kernel tend to be old ones you cannot trust.

And #include removals are not really a common case - sometimes someone 
cleans up something specific, but I don't think anyone will remove 
#include's of sched.h from random .c files (considering how much 
sched.h pulls in the fallout of such #include removals would be many
build breakages) unless someone seriously reorganizes sched.h itself.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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