linux-kernel - Re: [PATCH] drivers/input/ff-core.c needs <linux/sched.h>

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Message-ID: <20080701084316.ZZRA012@mailhub.coreip.homeip.net>
Date:	Tue, 1 Jul 2008 08:46:54 -0400
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>
Subject: Re: [PATCH] drivers/input/ff-core.c needs <linux/sched.h>

On Tue, Jul 01, 2008 at 01:55:25PM +0200, Geert Uytterhoeven wrote:
> commit 656acd2bbc4ce7f224de499ee255698701396c48
> Author: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Date:   Thu Jun 26 11:30:02 2008 -0400
> 
>     Input: fix locking in force-feedback core
> 
>     The newly added event_lock spinlock in the input core disallows sleeping
>     and therefore using mutexes in event handlers. Convert force-feedback 
>     core to rely on event_lock instead of mutex to protect slots allocated  
>     for fore-feedback effects. The original mutex is still used to serialize
>     uploading and erasing of effects.
> 
> causes the following regression on m68k:
> 
> | linux/drivers/input/ff-core.c: In function 'input_ff_upload':
> | linux/drivers/input/ff-core.c:172: error: dereferencing pointer to incomplete type
> | linux/drivers/input/ff-core.c: In function 'erase_effect':
> | linux/drivers/input/ff-core.c:197: error: dereferencing pointer to incomplete type
> | linux/drivers/input/ff-core.c:204: error: dereferencing pointer to incomplete type
> | make[4]: *** [drivers/input/ff-core.o] Error 1
> 

Argh! Sorry about it.

> As the incomplete type is `struct task_struct', including <linux/sched.h> fixes
> it.

Not linux/spinlock.h? I wonder if I need to include linux/spinlock.h and
linux/mutex.h directly from linux/input.h... What is the current
policy on headers - do they need to include everything to be
functional or it is responsibility of the user?

-- 
Dmitry
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