diff options
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index d3f722d20f9..b08e697cd83 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -141,11 +141,12 @@ static int alloc_pidmap(struct pid_namespace *pid_ns) * installing it: */ spin_lock_irq(&pidmap_lock); - if (map->page) - kfree(page); - else + if (!map->page) { map->page = page; + page = NULL; + } spin_unlock_irq(&pidmap_lock); + kfree(page); if (unlikely(!map->page)) break; } @@ -268,12 +269,11 @@ struct pid *alloc_pid(struct pid_namespace *ns) for (type = 0; type < PIDTYPE_MAX; ++type) INIT_HLIST_HEAD(&pid->tasks[type]); + upid = pid->numbers + ns->level; spin_lock_irq(&pidmap_lock); - for (i = ns->level; i >= 0; i--) { - upid = &pid->numbers[i]; + for ( ; upid >= pid->numbers; --upid) hlist_add_head_rcu(&upid->pid_chain, &pid_hash[pid_hashfn(upid->nr, upid->ns)]); - } spin_unlock_irq(&pidmap_lock); out: @@ -367,7 +367,7 @@ struct task_struct *pid_task(struct pid *pid, enum pid_type type) struct task_struct *result = NULL; if (pid) { struct hlist_node *first; - first = rcu_dereference(pid->tasks[type].first); + first = rcu_dereference_check(pid->tasks[type].first, rcu_read_lock_held() || lockdep_is_held(&tasklist_lock)); if (first) result = hlist_entry(first, struct task_struct, pids[(type)].node); } |