fs: avoid adding non-thread-group task to LMK rbtree

To maintain the task adj RB tree, we add a task to the RB tree when fork,
and delete it when exit. The place is exactly the same as the linear
p->tasks list, say, nly when the task is thread_group_leader.

When task group_leader is changing, we make sure to add the new leader
into RB tree after its leader flag is set, task->exit_signal.

Cherry-picked from (CR): http://gerrit.mot.com/753419/

Change-Id: I8da47998510e531188feb067b491e92306be9414
Signed-off-by: Hong-Mei Li <a21834@motorola.com>
Reviewed-on: http://gerrit.mot.com/753419
SLTApproved: Slta Waiver <sltawvr@motorola.com>
SME-Granted: SME Approvals Granted
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Zhi-Ming Yuan <a14194@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Reviewed-on: http://gerrit.mot.com/766106
Reviewed-by: Sudharsan Yettapu <sudharsan.yettapu@motorola.com>
Reviewed-by: Ravikumar Vembu <raviv@motorola.com>
(cherry picked from commit e9e92d64142625981490dd5c323aa08467d349e8)
Reviewed-on: http://gerrit.mot.com/768301

Conflicts:
	fs/exec.c

0 files changed, 0 insertions, 0 deletions