rcu: Convert to raw_spinlocks

The spinlocks in rcutree need to be real spinlocks in
preempt-rt. Convert them to raw_spinlocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1266887105-1528-18-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 3 deletions

diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 7495fed49c30..6a82c34ce669 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -90,7 +90,7 @@ struct rcu_dynticks {
  * Definition for node within the RCU grace-period-detection hierarchy.
  */
 struct rcu_node {
-        spinlock_t lock;        /* Root rcu_node's lock protects some */
+        raw_spinlock_t lock;    /* Root rcu_node's lock protects some */
                                 /*  rcu_state fields as well as following. */
         unsigned long gpnum;    /* Current grace period for this node. */
                                 /*  This will either be equal to or one */
@@ -291,7 +291,7 @@ struct rcu_state {
 
         /* End of fields guarded by root rcu_node's lock. */
 
-        spinlock_t onofflock;                   /* exclude on/offline and */
+        raw_spinlock_t onofflock;               /* exclude on/offline and */
                                                 /*  starting new GP.  Also */
                                                 /*  protects the following */
                                                 /*  orphan_cbs fields. */
@@ -301,7 +301,7 @@ struct rcu_state {
                                                 /*  going offline. */
         struct rcu_head **orphan_cbs_tail;      /* And tail pointer. */
         long orphan_qlen;                       /* Number of orphaned cbs. */
-        spinlock_t fqslock;                     /* Only one task forcing */
+        raw_spinlock_t fqslock;                 /* Only one task forcing */
                                                 /*  quiescent states. */
         unsigned long jiffies_force_qs;         /* Time at which to invoke */
                                                 /*  force_quiescent_state(). */