Commit 10ebffde authored by Al Viro's avatar Al Viro Committed by Linus Torvalds
Browse files

[PATCH] m68k: introduce setup_thread_stack() and end_of_stack() 



encapsulates the rest of arch-dependent operations with thread_info access.
Two new helpers - setup_thread_stack() and end_of_stack().  For normal case
the former consists of copying thread_info of parent to new thread_info and
the latter returns pointer immediately past the end of thread_info.

Signed-off-by: default avatarAl Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: default avatarRoman Zippel <zippel@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a1261f54

include/linux/sched.h

+11 −0
Original line number Diff line number Diff line
@@ -1235,6 +1235,17 @@ static inline void task_unlock(struct task_struct *p) 


#define task_thread_info(task) (task)->thread_info



static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)

{

	*task_thread_info(p) = *task_thread_info(org);

	task_thread_info(p)->task = p;

}



static inline unsigned long *end_of_stack(struct task_struct *p)

{

	return (unsigned long *)(p->thread_info + 1);

}



/* set thread flags in other task's structures

 * - see asm/thread_info.h for TIF_xxxx flags available

 */

kernel/fork.c

+1 −2
Original line number Diff line number Diff line
@@ -171,10 +171,9 @@ static struct task_struct *dup_task_struct(struct task_struct *orig) 
		return NULL;

	}



	*ti = *orig->thread_info;

	*tsk = *orig;

	tsk->thread_info = ti;

	ti->task = tsk;

	setup_thread_stack(tsk, orig);



	/* One for us, one for whoever does the "release_task()" (usually parent) */

	atomic_set(&tsk->usage,2);

kernel/sched.c

+2 −2
Original line number Diff line number Diff line
@@ -4327,10 +4327,10 @@ static void show_task(task_t *p) 
#endif

#ifdef CONFIG_DEBUG_STACK_USAGE

	{

		unsigned long *n = (unsigned long *) (p->thread_info+1);

		unsigned long *n = end_of_stack(p);

		while (!*n)

			n++;

		free = (unsigned long) n - (unsigned long)(p->thread_info+1);

		free = (unsigned long)n - (unsigned long)end_of_stack(p);

	}

#endif

	printk("%5lu %5d %6d ", free, p->pid, p->parent->pid);

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