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authorEric W. Biederman <ebiederm@xmission.com>2017-06-04 04:32:13 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-07-21 10:43:12 -0500
commit6883f81aac6f44e7df70a6af189b3689ff52cbfb (patch)
tree184e376d23aa5ea7321e22f23dd78a3c77c74a63 /kernel/pid.c
parent2c4704756cab7cfa031ada4dab361562f0e357c0 (diff)
downloadlwn-6883f81aac6f44e7df70a6af189b3689ff52cbfb.tar.gz
lwn-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.c2
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];
}