summaryrefslogtreecommitdiffstats
path: root/kernel/time/itimer.c
diff options
context:
space:
mode:
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/time/itimer.c
parent2c4704756cab7cfa031ada4dab361562f0e357c0 (diff)
downloadlinux-stable-6883f81aac6f44e7df70a6af189b3689ff52cbfb.tar.gz
linux-stable-6883f81aac6f44e7df70a6af189b3689ff52cbfb.tar.bz2
linux-stable-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/time/itimer.c')
-rw-r--r--kernel/time/itimer.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c
index f26acef5d7b4..9a65713c8309 100644
--- a/kernel/time/itimer.c
+++ b/kernel/time/itimer.c
@@ -139,9 +139,10 @@ enum hrtimer_restart it_real_fn(struct hrtimer *timer)
{
struct signal_struct *sig =
container_of(timer, struct signal_struct, real_timer);
+ struct pid *leader_pid = sig->pids[PIDTYPE_TGID];
- trace_itimer_expire(ITIMER_REAL, sig->leader_pid, 0);
- kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
+ trace_itimer_expire(ITIMER_REAL, leader_pid, 0);
+ kill_pid_info(SIGALRM, SEND_SIG_PRIV, leader_pid);
return HRTIMER_NORESTART;
}