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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 /kernel/rcutree.h | |
| parent | 6887a4131da3adaab011613776d865f4bcfb5678 (diff) | |
| download | linux-cba6d0d64ee53772b285d0c0c288deefbeaf7775.tar.bz2 | |
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/rcutree.h')
| -rw-r--r-- | kernel/rcutree.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h index ea056495783e..19b61ac1079f 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -444,6 +444,7 @@ DECLARE_PER_CPU(char, rcu_cpu_has_work); /* Forward declarations for rcutree_plugin.h */ static void rcu_bootup_announce(void); long rcu_batches_completed(void); +static void rcu_preempt_note_context_switch(int cpu); static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp); #ifdef CONFIG_HOTPLUG_CPU static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, |