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authorOleg Nesterov <oleg@redhat.com>2011-06-22 23:09:09 +0200
committerOleg Nesterov <oleg@redhat.com>2011-06-27 20:30:09 +0200
commit8677347378044ab564470bced2275520efb3670d (patch)
tree61baa72f24bb12eadd6956fb0abeb7eabda46b88 /kernel/exit.c
parent9843a1e977977986d0a4c1000f2229b032572534 (diff)
make do_notify_parent() __must_check, update the callers
Change other callers of do_notify_parent() to check the value it returns, this makes the subsequent task_detached() unnecessary. Mark do_notify_parent() as __must_check. Use thread_group_leader() instead of !task_detached() to check if we need to notify the real parent in wait_task_zombie(). Remove the stale comment in release_task(). "just for sanity" is no longer true, we have to set EXIT_DEAD to avoid the races with do_wait(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c29
1 files changed, 8 insertions, 21 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index bb08e938ca7..f68d137ffeb 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -190,21 +190,12 @@ repeat:
leader = p->group_leader;
if (leader != p && thread_group_empty(leader) && leader->exit_state == EXIT_ZOMBIE) {
BUG_ON(task_detached(leader));
- do_notify_parent(leader, leader->exit_signal);
/*
* If we were the last child thread and the leader has
* exited already, and the leader's parent ignores SIGCHLD,
* then we are the one who should release the leader.
- *
- * do_notify_parent() will have marked it self-reaping in
- * that case.
- */
- zap_leader = task_detached(leader);
-
- /*
- * This maintains the invariant that release_task()
- * only runs on a task in EXIT_DEAD, just for sanity.
*/
+ zap_leader = do_notify_parent(leader, leader->exit_signal);
if (zap_leader)
leader->exit_state = EXIT_DEAD;
}
@@ -766,8 +757,7 @@ static void reparent_leader(struct task_struct *father, struct task_struct *p,
/* If it has exited notify the new parent about this child's death. */
if (!p->ptrace &&
p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) {
- do_notify_parent(p, p->exit_signal);
- if (task_detached(p)) {
+ if (do_notify_parent(p, p->exit_signal)) {
p->exit_state = EXIT_DEAD;
list_move_tail(&p->sibling, dead);
}
@@ -1351,16 +1341,13 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
/* We dropped tasklist, ptracer could die and untrace */
ptrace_unlink(p);
/*
- * If this is not a detached task, notify the parent.
- * If it's still not detached after that, don't release
- * it now.
+ * If this is not a sub-thread, notify the parent.
+ * If parent wants a zombie, don't release it now.
*/
- if (!task_detached(p)) {
- do_notify_parent(p, p->exit_signal);
- if (!task_detached(p)) {
- p->exit_state = EXIT_ZOMBIE;
- p = NULL;
- }
+ if (thread_group_leader(p) &&
+ !do_notify_parent(p, p->exit_signal)) {
+ p->exit_state = EXIT_ZOMBIE;
+ p = NULL;
}
write_unlock_irq(&tasklist_lock);
}