Re: [PATCH] severing module.h->sched.h

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On Mon, 4 Dec 2006, Linux Kernel Mailing List wrote:
> Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f6a570333e554b48ad589e7137c77c57809eee81
> Commit:     f6a570333e554b48ad589e7137c77c57809eee81
> Parent:     2b5f6dcce5bf94b9b119e9ed8d537098ec61c3d2
> Author:     Al Viro <[email protected]>
> AuthorDate: Wed Oct 18 01:47:25 2006 -0400
> Committer:  Al Viro <[email protected]>
> CommitDate: Mon Dec 4 02:00:22 2006 -0500
> 
>     [PATCH] severing module.h->sched.h
>     
>     Signed-off-by: Al Viro <[email protected]>

> diff --git a/include/linux/module.h b/include/linux/module.h
> index 9258ffd..d33df24 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -6,7 +6,6 @@
>   * Rewritten by Richard Henderson <[email protected]> Dec 1996
>   * Rewritten again by Rusty Russell, 2002
>   */
> -#include <linux/sched.h>
>  #include <linux/spinlock.h>
>  #include <linux/list.h>
>  #include <linux/stat.h>

This change causes the following compile errors on m68k:

| linux-2.6.20-rc4/kernel/time/clocksource.c: In function `sysfs_show_current_clocksources':
| linux-2.6.20-rc4/kernel/time/clocksource.c:204: error: dereferencing pointer to incomplete type
| linux-2.6.20-rc4/kernel/time/clocksource.c: In function `sysfs_override_clocksource':
| linux-2.6.20-rc4/kernel/time/clocksource.c:243: error: dereferencing pointer to incomplete type
| linux-2.6.20-rc4/kernel/time/clocksource.c: In function `sysfs_show_available_clocksources':
| linux-2.6.20-rc4/kernel/time/clocksource.c:268: error: dereferencing pointer to incomplete type

spin_lock_irq
    -> _spin_lock_irq
    -> preempt_disable
    -> inc_preempt_count
    -> add_preempt_count
    -> preempt_count
    -> current_thread_info
    -> task_thread_info
which needs the definition of struct task_struct.

The patch below fixes it by including <linux/sched.h> in
kernel/time/clocksource.c. But perhaps this is the right time to move
struct task_struct to its own include instead?

Signed-off-by: Geert Uytterhoeven <[email protected]>

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 22504af..dda1e21 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -28,6 +28,7 @@
 #include <linux/sysdev.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/sched.h>
 
 /* XXX - Would like a better way for initializing curr_clocksource */
 extern struct clocksource clocksource_jiffies;

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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