Eric W. Biederman 2c4704756c 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>

2018-07-21 10:43:12 -05:00

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