more thread_info patches

[Roman Zippel <zippel@linux-m68k.org>]

Hi,

On Thu, 21 Apr 2005, Al Viro wrote:

> 	thread_info, part 1:

Here are some possible followup patches. Since it's already some time ago 
here are the original posts for everyone else:
http://marc.theaimsgroup.com/?l=linux-kernel&m=111410539627881&w=2

This introduces an additional stack variable in task_struct. It's 
basically redundant with the thread_info pointer, but in the long term I'd 
like to get of the latter (with the following patches).

bye, Roman

---

 include/linux/init_task.h |    1 +
 include/linux/sched.h     |    1 +
 kernel/fork.c             |    1 +
 3 files changed, 3 insertions(+)

Index: linux-2.6-mm/include/linux/sched.h
===================================================================
--- linux-2.6-mm.orig/include/linux/sched.h	2005-05-31 01:19:01.636591190 +0200
+++ linux-2.6-mm/include/linux/sched.h	2005-05-31 01:19:05.913856451 +0200
@@ -617,6 +617,7 @@ struct mempolicy;
 struct task_struct {
 	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
 	struct thread_info *thread_info;
+	void *stack;
 	atomic_t usage;
 	unsigned long flags;	/* per process flags, defined below */
 	unsigned long ptrace;
Index: linux-2.6-mm/include/linux/init_task.h
===================================================================
--- linux-2.6-mm.orig/include/linux/init_task.h	2005-05-31 01:19:01.636591190 +0200
+++ linux-2.6-mm/include/linux/init_task.h	2005-05-31 01:19:05.913856451 +0200
@@ -71,6 +71,7 @@ extern struct group_info init_groups;
 {									\
 	.state		= 0,						\
 	.thread_info	= &init_thread_info,				\
+	.stack		= &init_stack,					\
 	.usage		= ATOMIC_INIT(2),				\
 	.flags		= 0,						\
 	.lock_depth	= -1,						\
Index: linux-2.6-mm/kernel/fork.c
===================================================================
--- linux-2.6-mm.orig/kernel/fork.c	2005-05-31 01:19:01.636591190 +0200
+++ linux-2.6-mm/kernel/fork.c	2005-05-31 01:19:29.954726757 +0200
@@ -173,6 +173,7 @@ static struct task_struct *dup_task_stru
 	*tsk = *orig;
 	setup_thread_info(tsk, ti);
 	tsk->thread_info = ti;
+	tsk->stack = ti;
 	ti->task = tsk;
 
 	/* One for us, one for whoever does the "release_task()" (usually parent) */
-
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