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[rcu,6/8] rcu: The rcu_needs_cpu() function is not a quiescent state

Message ID 1339129615-1795-6-git-send-email-paulmck@linux.vnet.ibm.com
State Accepted
Commit 28f8555364ef5b54b21251c5c8022109a70626e9
Headers show

Commit Message

Paul E. McKenney June 8, 2012, 4:26 a.m. UTC 
From: "Paul E. McKenney" <paul.mckenney@linaro.org>

The TINY_PREEMPT_RCU() function rcu_preempt_needs_cpu(), which is called
from rcu_needs_cpu(), assumes that it is in a quiescent state with respect
to the CPU.  This is no longer the case.  This commit therefore updates
rcu_preempt_needs_cpu() to make it aware that it is not running in a
quiescent state.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Tested-by: Pascal Chapperon <pascal.chapperon@wanadoo.fr>
---
 kernel/rcutiny_plugin.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
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Patch

diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
index fc31a2d..849ede5 100644
--- a/kernel/rcutiny_plugin.h
+++ b/kernel/rcutiny_plugin.h
@@ -846,8 +846,6 @@  EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
  */
 int rcu_preempt_needs_cpu(void)
 {
-	if (!rcu_preempt_running_reader())
-		rcu_preempt_cpu_qs();
 	return rcu_preempt_ctrlblk.rcb.rcucblist != NULL;
 }