[patch] linux/preempt.h needs linux/thread_info.h

[Horms <horms@verge.net.au>]

It seems that linux/preempt.h needs to include linux/thread_info.h
in order to access current_thread_info(), which is used in
preempt_count().

I guess that all callers of preempt_count() must include
both linux/thread_info.h and linux/preempt.h directly or indirectly,
as this does not cause a compile error. I noticed the problem while
working on an unrelated issue in xen-land.

Signed-off-by: Simon Horman <horms@verge.net.au>

Index: linux-2.6/include/linux/preempt.h
===================================================================
--- linux-2.6.orig/include/linux/preempt.h	2006-12-27 16:58:46.000000000 +0900
+++ linux-2.6/include/linux/preempt.h	2006-12-27 17:13:12.000000000 +0900
@@ -8,6 +8,7 @@
 
 #include <linux/thread_info.h>
 #include <linux/linkage.h>
+#include <linux/thread_info.h>
 
 #ifdef CONFIG_DEBUG_PREEMPT
   extern void fastcall add_preempt_count(int val);