commit 0d5fc10affd5f25f2c7dde2d477b262a990c9f30
author Vikram Mulukutla <markivx@codeaurora.org> Thu Sep 21 17:24:24 2017 -0700
committer Amit Pundir <amit.pundir@linaro.org> Thu Aug 30 13:45:19 2018 +0530
tree 319b185644e9cccdbab547d7369d3bda97aa42db
parent 9247a101ace5171737ce3ea3c13cf42dc3f5cd11

ANDROID: Revert "ANDROID: sched/tune: Initialize raw_spin_lock in boosted_groups"

This reverts commit c5616f2f874faa20b59b116177b99bf3948586df.

If we re-init the per-cpu boostgroup spinlock every time that
we add a new boosted cgroup, we can easily wipe out (reinit)
a spinlock struct while in a critical section. We should only
be setting up the per-cpu boostgroup data, and the spin_lock
initialization need only happen once - which we're already
doing in a postcore_initcall.

For example:

     -------- CPU 0 --------   | -------- CPU1 --------
cgroupX boost group added      |
schedtune_enqueue_task         |
  acquires(bg->lock)           | cgroupY boost group added
                               |  for_each_cpu()
                               |    raw_spin_lock_init(bg->lock)
  releases(bg->lock)           |
      BUG (already unlocked)   |
                               |

This results in the following BUG from the debug spinlock code:
	BUG: spinlock already unlocked on CPU#5, rcuop/6/68

Bug: 32668852

Change-Id: I3016702780b461a0cd95e26c538cd18df27d6316
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>