cba6d0d64ee53772b285d0c0c288deefbeaf7775 - kernel/msm-4.9

commit	cba6d0d64ee53772b285d0c0c288deefbeaf7775	[log] [tgz]
author	Paul E. McKenney <paulmck@linux.vnet.ibm.com>	Mon Jul 02 07:08:42 2012 -0700
committer	Paul E. McKenney <paulmck@linux.vnet.ibm.com>	Mon Jul 02 11:39:19 2012 -0700
tree	b2d3de62d15a77d23708c1af6f188c86f0d87fb9
parent	6887a4131da3adaab011613776d865f4bcfb5678 [diff]

Revert "rcu: Move PREEMPT_RCU preemption to switch_to() invocation"

This reverts commit 616c310e83b872024271c915c1b9ab505b9efad9.
(Move PREEMPT_RCU preemption to switch_to() invocation).
Testing by Sasha Levin <levinsasha928@gmail.com> showed that this
can result in deadlock due to invoking the scheduler when one of
the runqueue locks is held.  Because this commit was simply a
performance optimization, revert it.

Reported-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Sasha Levin <levinsasha928@gmail.com>

arch/um/drivers/mconsole_kern.c[diff]
include/linux/rcupdate.h[diff]
include/linux/rcutiny.h[diff]
include/linux/sched.h[diff]
kernel/rcutree.c[diff]
kernel/rcutree.h[diff]
kernel/rcutree_plugin.h[diff]
kernel/sched/core.c[diff]

8 files changed

tree: b2d3de62d15a77d23708c1af6f188c86f0d87fb9