From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Tue, 21 Mar 2017 17:35:57 +0000 (-0700)
Subject: srcu: Allow a second bit in rcu_seq for SRCU state
X-Git-Tag: MMI-PSA29.97-13-9~5623^2~5^2^3~10
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f1ec57a462314f3d1cd0c9c8a04979228aa9d38c;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

srcu: Allow a second bit in rcu_seq for SRCU state

This commit increases the number of reserved bits at the bottom of an
rcu_seq grace-period counter from one to two, as will be needed to
accommodate SRCU's three-state grace periods.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index c62df93bfc1b..87a0ac95b551 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -61,7 +61,7 @@
  * Grace-period counter management.
  */
 
-#define RCU_SEQ_CTR_SHIFT	1
+#define RCU_SEQ_CTR_SHIFT	2
 #define RCU_SEQ_STATE_MASK	((1 << RCU_SEQ_CTR_SHIFT) - 1)
 
 /*