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Commit b28a7c01 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Tell the compiler that rcu_state_p is immutable 



This commit adds a "const" tag to the declarations of rcu_state_p,
which should allow the compiler to generate better code and also to
catch erroneous assignments to this variable.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 727b705b

kernel/rcu/tree.c

+1 −1
Original line number Diff line number Diff line
@@ -110,7 +110,7 @@ struct rcu_state sname##_state = { \ 
RCU_STATE_INITIALIZER(rcu_sched, 's', call_rcu_sched);

RCU_STATE_INITIALIZER(rcu_bh, 'b', call_rcu_bh);



static struct rcu_state *rcu_state_p;

static struct rcu_state *const rcu_state_p;

LIST_HEAD(rcu_struct_flavors);



/* Increase (but not decrease) the CONFIG_RCU_FANOUT_LEAF at boot time. */

kernel/rcu/tree_plugin.h

+2 −2
Original line number Diff line number Diff line
@@ -100,7 +100,7 @@ static void __init rcu_bootup_announce_oddness(void) 
#ifdef CONFIG_PREEMPT_RCU



RCU_STATE_INITIALIZER(rcu_preempt, 'p', call_rcu);

static struct rcu_state *rcu_state_p = &rcu_preempt_state;

static struct rcu_state *const rcu_state_p = &rcu_preempt_state;



static int rcu_preempted_readers_exp(struct rcu_node *rnp);

static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
@@ -834,7 +834,7 @@ void exit_rcu(void) 


#else /* #ifdef CONFIG_PREEMPT_RCU */



static struct rcu_state *rcu_state_p = &rcu_sched_state;

static struct rcu_state *const rcu_state_p = &rcu_sched_state;



/*

 * Tell them what RCU they are running.