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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-07-02 07:08:42 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-07-02 11:39:19 -0700
commitcba6d0d64ee53772b285d0c0c288deefbeaf7775 (patch)
treeb2d3de62d15a77d23708c1af6f188c86f0d87fb9 /kernel/sched
parent6887a4131da3adaab011613776d865f4bcfb5678 (diff)
downloadop-kernel-dev-cba6d0d64ee53772b285d0c0c288deefbeaf7775.zip
op-kernel-dev-cba6d0d64ee53772b285d0c0c288deefbeaf7775.tar.gz
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>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d5594a4..eaead2d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2081,7 +2081,6 @@ context_switch(struct rq *rq, struct task_struct *prev,
#endif
/* Here we just switch the register state and the stack. */
- rcu_switch_from(prev);
switch_to(prev, next, prev);
barrier();
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