diff options
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index eeb836b65ca4..8387e8c68193 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -218,14 +218,11 @@ struct pid * fastcall find_pid(int nr) return NULL; } -int fastcall attach_pid(task_t *task, enum pid_type type, int nr) +int fastcall attach_pid(struct task_struct *task, enum pid_type type, int nr) { struct pid_link *link; struct pid *pid; - WARN_ON(!task->pid); /* to be removed soon */ - WARN_ON(!nr); /* to be removed soon */ - link = &task->pids[type]; link->pid = pid = find_pid(nr); hlist_add_head_rcu(&link->node, &pid->tasks[type]); @@ -233,7 +230,7 @@ int fastcall attach_pid(task_t *task, enum pid_type type, int nr) return 0; } -void fastcall detach_pid(task_t *task, enum pid_type type) +void fastcall detach_pid(struct task_struct *task, enum pid_type type) { struct pid_link *link; struct pid *pid; @@ -252,6 +249,15 @@ void fastcall detach_pid(task_t *task, enum pid_type type) free_pid(pid); } +/* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */ +void fastcall transfer_pid(struct task_struct *old, struct task_struct *new, + enum pid_type type) +{ + new->pids[type].pid = old->pids[type].pid; + hlist_replace_rcu(&old->pids[type].node, &new->pids[type].node); + old->pids[type].pid = NULL; +} + struct task_struct * fastcall pid_task(struct pid *pid, enum pid_type type) { struct task_struct *result = NULL; @@ -267,7 +273,7 @@ struct task_struct * fastcall pid_task(struct pid *pid, enum pid_type type) /* * Must be called under rcu_read_lock() or with tasklist_lock read-held. */ -task_t *find_task_by_pid_type(int type, int nr) +struct task_struct *find_task_by_pid_type(int type, int nr) { return pid_task(find_pid(nr), type); } |