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

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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: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Al Viro 2005-11-13 16:06:56 -08:00 committed by Linus Torvalds
parent a1261f5461
commit 10ebffde3d
3 changed files with 14 additions and 4 deletions
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11
include/linux/sched.h
View file

@ -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
*/

3
kernel/fork.c
View file

@ -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);

4
kernel/sched.c
View file

@ -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);