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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 16:08:42 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 20:39:19 +0200 |
| commit | cba6d0d64ee53772b285d0c0c288deefbeaf7775 (patch) | |
| tree | b2d3de62d15a77d23708c1af6f188c86f0d87fb9 /kernel/sched/core.c | |
| parent | Linux 3.5-rc5 (diff) | |
| download | linux-cba6d0d64ee53772b285d0c0c288deefbeaf7775.tar.xz linux-cba6d0d64ee53772b285d0c0c288deefbeaf7775.zip | |
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 '')
| -rw-r--r-- | kernel/sched/core.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d5594a4268d4..eaead2df6aa8 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(); |