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| 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/pid.c | |
| parent | 4ac24b3ba9016881b11646114bb5cd12cf23edd9 (diff) | |
| download | lwn-e713d0dab21a68500720e222fa02567fc7dfb14b.tar.gz lwn-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/pid.c')
| -rw-r--r-- | kernel/pid.c | 9 |
1 files changed, 6 insertions, 3 deletions
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; |