Upstream commits to be applied
==============================
e3fca9e: sched: Replace post_schedule with a balance callback list
4c9a4bc: sched: Allow balance callbacks for check_class_changed()
8046d68: sched,rt: Remove return value from pull_rt_task()
fd7a4be: sched, rt: Convert switched_{from, to}_rt() / prio_changed_rt() to balance callbacks
0ea60c2: sched,dl: Remove return value from pull_dl_task()
9916e21: sched, dl: Convert switched_{from, to}_dl() / prio_changed_dl() to balance callbacks
The reason why these should be applied
======================================
Our products developed using 3.16 kernel, faced a kernel oops which can
be fixed with above upstreamed patches. The oops is caused by "Unable
to handle kernel NULL pointer dereference at virtual address 000000xx"
in the call path,
__sched_setscheduler()
check_class_changed()
switched_to_fair()
check_preempt_curr()
check_preempt_wakeup()
find_matching_se()
is_same_group()
by "if (se->cfs_rq == pse->cfs_rq) // se, pse == NULL" condition.
How to apply it
===============
For stable 4.2.8+:
N/A (already applied)
For longterm 4.1.15:
Cherry-picking the upsteam commits works with a trivial conflict.
For longterm 3.18.25:
Refer to the backported patches in this thread.
For longterm 3.14.58:
Refer to the backported patches in this thread. And applying
additional "6c3b4d4: sched: Clean up idle task SMP logic" commit
makes backporting the upstream commits much simpler. So my
backporting patches include the patch.
For longterm 2.6.32.69 ~ 3.12.51: Need to be backported. (I didn't)
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