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authorOleg Nesterov <oleg@tv-sign.ru>2008-02-06 01:36:13 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 10:41:00 -0800
commitd9ae90ac4bdce769ddb27c2e24c3351a30c3daf8 (patch)
tree220f88576b5c83369892ce13cb180bab6cccba7a
parent06b8e878a9bc9301201cffe186eba99c4185f20a (diff)
use __set_task_state() for TRACED/STOPPED tasks
1. It is much easier to grep for ->state change if __set_task_state() is used instead of the direct assignment. 2. ptrace_stop() and handle_group_stop() use set_task_state() which adds the unneeded mb() (btw even if we use mb() it is still possible that do_wait() sees the new ->state but not ->exit_code, but this is ok). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/fork.c2
-rw-r--r--kernel/ptrace.c10
-rw-r--r--kernel/signal.c2
3 files changed, 6 insertions, 8 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 2b55b74cd99..8adfe5ddb68 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1510,7 +1510,7 @@ long do_fork(unsigned long clone_flags,
if (!(clone_flags & CLONE_STOPPED))
wake_up_new_task(p, clone_flags);
else
- p->state = TASK_STOPPED;
+ __set_task_state(p, TASK_STOPPED);
if (unlikely (trace)) {
current->ptrace_message = nr;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index b0d4ab4dfd3..74730e0c1be 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -53,7 +53,7 @@ void ptrace_untrace(struct task_struct *child)
spin_lock(&child->sighand->siglock);
if (task_is_traced(child)) {
if (child->signal->flags & SIGNAL_STOP_STOPPED) {
- child->state = TASK_STOPPED;
+ __set_task_state(child, TASK_STOPPED);
} else {
signal_wake_up(child, 1);
}
@@ -103,18 +103,16 @@ int ptrace_check_attach(struct task_struct *child, int kill)
&& child->signal != NULL) {
ret = 0;
spin_lock_irq(&child->sighand->siglock);
- if (task_is_stopped(child)) {
+ if (task_is_stopped(child))
child->state = TASK_TRACED;
- } else if (!task_is_traced(child) && !kill) {
+ else if (!task_is_traced(child) && !kill)
ret = -ESRCH;
- }
spin_unlock_irq(&child->sighand->siglock);
}
read_unlock(&tasklist_lock);
- if (!ret && !kill) {
+ if (!ret && !kill)
wait_task_inactive(child);
- }
/* All systems go.. */
return ret;
diff --git a/kernel/signal.c b/kernel/signal.c
index 6a5f97cd337..e46971560fc 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1601,7 +1601,7 @@ static void ptrace_stop(int exit_code, int nostop_code, siginfo_t *info)
current->exit_code = exit_code;
/* Let the debugger run. */
- set_current_state(TASK_TRACED);
+ __set_current_state(TASK_TRACED);
spin_unlock_irq(&current->sighand->siglock);
try_to_freeze();
read_lock(&tasklist_lock);