diff options
author | Eric W. Biederman <ebiederm@xmission.com> | 2017-06-04 11:32:13 +0200 |
---|---|---|
committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-07-21 17:43:12 +0200 |
commit | 6883f81aac6f44e7df70a6af189b3689ff52cbfb (patch) | |
tree | 184e376d23aa5ea7321e22f23dd78a3c77c74a63 /kernel/pid.c | |
parent | pids: Move the pgrp and session pid pointers from task_struct to signal_struct (diff) | |
download | linux-6883f81aac6f44e7df70a6af189b3689ff52cbfb.tar.xz linux-6883f81aac6f44e7df70a6af189b3689ff52cbfb.zip |
pid: Implement PIDTYPE_TGID
Everywhere except in the pid array we distinguish between a tasks pid and
a tasks tgid (thread group id). Even in the enumeration we want that
distinction sometimes so we have added __PIDTYPE_TGID. With leader_pid
we almost have an implementation of PIDTYPE_TGID in struct signal_struct.
Add PIDTYPE_TGID as a first class member of the pid_type enumeration and
into the pids array. Then remove the __PIDTYPE_TGID special case and the
leader_pid in signal_struct.
The net size increase is just an extra pointer added to struct pid and
an extra pair of pointers of an hlist_node added to task_struct.
The effect on code maintenance is the removal of a number of special
cases today and the potential to remove many more special cases as
PIDTYPE_TGID gets used to it's fullest. The long term potential
is allowing zombie thread group leaders to exit, which will remove
a lot more special cases in the code.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/pid.c')
-rw-r--r-- | kernel/pid.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index f8486d2e2346..de1cfc4f75a2 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -269,8 +269,6 @@ static struct pid **task_pid_ptr(struct task_struct *task, enum pid_type type) { return (type == PIDTYPE_PID) ? &task->thread_pid : - (type == __PIDTYPE_TGID) ? - &task->signal->leader_pid : &task->signal->pids[type]; } |