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| author | Al Viro <viro@parcelfarce.linux.theplanet.co.uk> | 2005-11-13 16:06:56 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-13 18:14:13 -0800 |
| commit | 10ebffde3d3916026974352b7900e44afe2b243f (patch) | |
| tree | ac88fa33694f5bea1b6958e1e56bcd4c9b95b002 | |
| parent | a1261f54611ec4ad6a7ab7080f86747e3ac3685b (diff) | |
| download | blackbird-op-linux-10ebffde3d3916026974352b7900e44afe2b243f.tar.gz blackbird-op-linux-10ebffde3d3916026974352b7900e44afe2b243f.zip | |
[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: 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>
| -rw-r--r-- | include/linux/sched.h | 11 | ||||
| -rw-r--r-- | kernel/fork.c | 3 | ||||
| -rw-r--r-- | kernel/sched.c | 4 |
3 files changed, 14 insertions, 4 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index f8650314ba2f..e4681256e43e 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -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 */ diff --git a/kernel/fork.c b/kernel/fork.c index 7ef352ce347b..2c70c9cdf5dc 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -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); diff --git a/kernel/sched.c b/kernel/sched.c index 831f7e9d8f1c..6f46c94cc29e 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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); |
