rcu: Remove unused rcu_data structure field

The ->preemptible field in rcu_data is only initialized in the function
rcu_init_percpu_data(), and never used.  This commit therefore removes
this field.

Signed-off-by: Iulia Manda <iulia.manda21@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b468899..2cc39c7 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3180,7 +3180,7 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
  * that this CPU cannot possibly have any RCU callbacks in flight yet.
  */
 static void
-rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptible)
+rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
 {
        unsigned long flags;
        unsigned long mask;
@@ -3193,7 +3193,6 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptible)
        /* Set up local state, ensuring consistent view of global state. */
        raw_spin_lock_irqsave(&rnp->lock, flags);
        rdp->beenonline = 1;     /* We have now been online. */
-       rdp->preemptible = preemptible;
        rdp->qlen_last_fqs_check = 0;
        rdp->n_force_qs_snap = rsp->n_force_qs;
        rdp->blimit = blimit;
@@ -3237,8 +3236,7 @@ static void rcu_prepare_cpu(int cpu)
        struct rcu_state *rsp;
 
        for_each_rcu_flavor(rsp)
-               rcu_init_percpu_data(cpu, rsp,
-                                    strcmp(rsp->name, "rcu_preempt") == 0);
+               rcu_init_percpu_data(cpu, rsp);
 }
 
 /*

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 7b572c5..13766ad 100644 (file)
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -252,7 +252,6 @@ struct rcu_data {
        bool            passed_quiesce; /* User-mode/idle loop etc. */
        bool            qs_pending;     /* Core waits for quiesc state. */
        bool            beenonline;     /* CPU online at least once. */
-       bool            preemptible;    /* Preemptible RCU? */
        struct rcu_node *mynode;        /* This CPU's leaf of hierarchy */
        unsigned long grpmask;          /* Mask to apply to leaf qsmask. */
 #ifdef CONFIG_RCU_CPU_STALL_INFO