tree 8757eb8762d60e34eeab747493759abf3f902c09
parent 71dbc8a96953aa91c50181a526acb7f80af74f67
author Eric W. Biederman <ebiederm@xmission.com> 1506449203 -0500
committer Eric W. Biederman <ebiederm@xmission.com> 1532187792 -0500

pids: Move the pgrp and session pid pointers from task_struct to signal_struct

To access these fields the code always has to go to group leader so
going to signal struct is no loss and is actually a fundamental simplification.

This saves a little bit of memory by only allocating the pid pointer array
once instead of once for every thread, and even better this removes a
few potential races caused by the fact that group_leader can be changed
by de_thread, while signal_struct can not.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>