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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 07:08:42 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 11:39:19 -0700 |
| commit | cba6d0d64ee53772b285d0c0c288deefbeaf7775 (patch) | |
| tree | b2d3de62d15a77d23708c1af6f188c86f0d87fb9 /arch/um/drivers/mconsole_kern.c | |
| parent | 6887a4131da3adaab011613776d865f4bcfb5678 (diff) | |
| download | linux-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 'arch/um/drivers/mconsole_kern.c')
| -rw-r--r-- | arch/um/drivers/mconsole_kern.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c index 88e466b159dcac..43b39d61b53869 100644 --- a/arch/um/drivers/mconsole_kern.c +++ b/arch/um/drivers/mconsole_kern.c @@ -705,7 +705,6 @@ static void stack_proc(void *arg) struct task_struct *from = current, *to = arg; to->thread.saved_task = from; - rcu_switch_from(from); switch_to(from, to, from); } |