diff options
| author | Sukadev Bhattiprolu <sukadev@us.ibm.com> | 2007-05-10 22:22:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-11 08:29:35 -0700 |
| commit | e713d0dab21a68500720e222fa02567fc7dfb14b (patch) | |
| tree | a56f90ce94d9287b73da6db72ed0e73542a70a07 /kernel | |
| parent | 4ac24b3ba9016881b11646114bb5cd12cf23edd9 (diff) | |
| download | linux-stable-e713d0dab21a68500720e222fa02567fc7dfb14b.tar.gz linux-stable-e713d0dab21a68500720e222fa02567fc7dfb14b.tar.bz2 linux-stable-e713d0dab21a68500720e222fa02567fc7dfb14b.zip | |
attach_pid() with struct pid parameter
attach_pid() currently takes a pid_t and then uses find_pid() to find the
corresponding struct pid. Sometimes we already have the struct pid. We can
then skip find_pid() if attach_pid() were to take a struct pid parameter.
Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: <containers@lists.osdl.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/exit.c | 4 | ||||
| -rw-r--r-- | kernel/fork.c | 11 | ||||
| -rw-r--r-- | kernel/pid.c | 9 | ||||
| -rw-r--r-- | kernel/sys.c | 2 |
4 files changed, 16 insertions, 10 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 7a5fd77f8fb0..e93691e9b325 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -302,12 +302,12 @@ void __set_special_pids(pid_t session, pid_t pgrp) if (process_session(curr) != session) { detach_pid(curr, PIDTYPE_SID); set_signal_session(curr->signal, session); - attach_pid(curr, PIDTYPE_SID, session); + attach_pid(curr, PIDTYPE_SID, find_pid(session)); } if (process_group(curr) != pgrp) { detach_pid(curr, PIDTYPE_PGID); curr->signal->pgrp = pgrp; - attach_pid(curr, PIDTYPE_PGID, pgrp); + attach_pid(curr, PIDTYPE_PGID, find_pid(pgrp)); } } diff --git a/kernel/fork.c b/kernel/fork.c index da92e01aba6b..6031800c94cf 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1249,16 +1249,19 @@ static struct task_struct *copy_process(unsigned long clone_flags, __ptrace_link(p, current->parent); if (thread_group_leader(p)) { + pid_t pgid = process_group(current); + pid_t sid = process_session(current); + p->signal->tty = current->signal->tty; - p->signal->pgrp = process_group(current); + p->signal->pgrp = pgid; set_signal_session(p->signal, process_session(current)); - attach_pid(p, PIDTYPE_PGID, process_group(p)); - attach_pid(p, PIDTYPE_SID, process_session(p)); + attach_pid(p, PIDTYPE_PGID, find_pid(pgid)); + attach_pid(p, PIDTYPE_SID, find_pid(sid)); list_add_tail_rcu(&p->tasks, &init_task.tasks); __get_cpu_var(process_counts)++; } - attach_pid(p, PIDTYPE_PID, p->pid); + attach_pid(p, PIDTYPE_PID, find_pid(p->pid)); nr_threads++; } diff --git a/kernel/pid.c b/kernel/pid.c index d3ad724afa83..d76f59326bd4 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -247,13 +247,16 @@ struct pid * fastcall find_pid(int nr) } EXPORT_SYMBOL_GPL(find_pid); -int fastcall attach_pid(struct task_struct *task, enum pid_type type, int nr) +/* + * attach_pid() must be called with the tasklist_lock write-held. + */ +int fastcall attach_pid(struct task_struct *task, enum pid_type type, + struct pid *pid) { struct pid_link *link; - struct pid *pid; link = &task->pids[type]; - link->pid = pid = find_pid(nr); + link->pid = pid; hlist_add_head_rcu(&link->node, &pid->tasks[type]); return 0; diff --git a/kernel/sys.c b/kernel/sys.c index df4c3a8f5df9..872271ccc384 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1488,7 +1488,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) if (process_group(p) != pgid) { detach_pid(p, PIDTYPE_PGID); p->signal->pgrp = pgid; - attach_pid(p, PIDTYPE_PGID, pgid); + attach_pid(p, PIDTYPE_PGID, find_pid(pgid)); } err = 0; |