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

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This reverts commit 616c310e83.
(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>
This commit is contained in:
Paul E. McKenney 2012-07-02 07:08:42 -07:00
commit cba6d0d64e
8 changed files with 19 additions and 16 deletions
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1
kernel/sched/core.c
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@ -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();