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rcu: Remove rsp parameter from rcu_gp_kthread() and friends
There now is only one rcu_state structure in a given build of the Linux kernel, so there is no need to pass it as a parameter to RCU's functions. This commit therefore removes the rsp parameter from rcu_gp_init(), rcu_gp_fqs_check_wake(), rcu_gp_fqs(), rcu_gp_cleanup(), and rcu_gp_kthread(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
parent
22212332c1
commit
0854a05c9f
1 changed files with 15 additions and 12 deletions
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@ -1832,13 +1832,14 @@ static void rcu_gp_slow(int delay)
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/*
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* Initialize a new grace period. Return false if no grace period required.
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*/
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static bool rcu_gp_init(struct rcu_state *rsp)
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static bool rcu_gp_init(void)
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{
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unsigned long flags;
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unsigned long oldmask;
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unsigned long mask;
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struct rcu_data *rdp;
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struct rcu_node *rnp = rcu_get_root();
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struct rcu_state *rsp = &rcu_state;
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WRITE_ONCE(rsp->gp_activity, jiffies);
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raw_spin_lock_irq_rcu_node(rnp);
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@ -1963,12 +1964,12 @@ static bool rcu_gp_init(struct rcu_state *rsp)
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* Helper function for swait_event_idle_exclusive() wakeup at force-quiescent-state
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* time.
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*/
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static bool rcu_gp_fqs_check_wake(struct rcu_state *rsp, int *gfp)
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static bool rcu_gp_fqs_check_wake(int *gfp)
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{
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struct rcu_node *rnp = rcu_get_root();
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/* Someone like call_rcu() requested a force-quiescent-state scan. */
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*gfp = READ_ONCE(rsp->gp_flags);
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*gfp = READ_ONCE(rcu_state.gp_flags);
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if (*gfp & RCU_GP_FLAG_FQS)
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return true;
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@ -1982,9 +1983,10 @@ static bool rcu_gp_fqs_check_wake(struct rcu_state *rsp, int *gfp)
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/*
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* Do one round of quiescent-state forcing.
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*/
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static void rcu_gp_fqs(struct rcu_state *rsp, bool first_time)
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static void rcu_gp_fqs(bool first_time)
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{
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struct rcu_node *rnp = rcu_get_root();
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struct rcu_state *rsp = &rcu_state;
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WRITE_ONCE(rsp->gp_activity, jiffies);
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rsp->n_force_qs++;
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@ -2007,13 +2009,14 @@ static void rcu_gp_fqs(struct rcu_state *rsp, bool first_time)
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/*
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* Clean up after the old grace period.
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*/
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static void rcu_gp_cleanup(struct rcu_state *rsp)
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static void rcu_gp_cleanup(void)
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{
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unsigned long gp_duration;
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bool needgp = false;
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unsigned long new_gp_seq;
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struct rcu_data *rdp;
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struct rcu_node *rnp = rcu_get_root();
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struct rcu_state *rsp = &rcu_state;
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struct swait_queue_head *sq;
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WRITE_ONCE(rsp->gp_activity, jiffies);
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@ -2090,13 +2093,13 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
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/*
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* Body of kthread that handles grace periods.
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*/
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static int __noreturn rcu_gp_kthread(void *arg)
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static int __noreturn rcu_gp_kthread(void *unused)
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{
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bool first_gp_fqs;
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int gf;
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unsigned long j;
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int ret;
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struct rcu_state *rsp = arg;
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struct rcu_state *rsp = &rcu_state;
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struct rcu_node *rnp = rcu_get_root();
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rcu_bind_gp_kthread();
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@ -2112,7 +2115,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
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RCU_GP_FLAG_INIT);
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rsp->gp_state = RCU_GP_DONE_GPS;
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/* Locking provides needed memory barrier. */
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if (rcu_gp_init(rsp))
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if (rcu_gp_init())
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break;
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cond_resched_tasks_rcu_qs();
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WRITE_ONCE(rsp->gp_activity, jiffies);
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@ -2137,7 +2140,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
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TPS("fqswait"));
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rsp->gp_state = RCU_GP_WAIT_FQS;
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ret = swait_event_idle_timeout_exclusive(rsp->gp_wq,
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rcu_gp_fqs_check_wake(rsp, &gf), j);
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rcu_gp_fqs_check_wake(&gf), j);
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rsp->gp_state = RCU_GP_DOING_FQS;
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/* Locking provides needed memory barriers. */
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/* If grace period done, leave loop. */
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@ -2150,7 +2153,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
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trace_rcu_grace_period(rsp->name,
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READ_ONCE(rsp->gp_seq),
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TPS("fqsstart"));
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rcu_gp_fqs(rsp, first_gp_fqs);
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rcu_gp_fqs(first_gp_fqs);
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first_gp_fqs = false;
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trace_rcu_grace_period(rsp->name,
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READ_ONCE(rsp->gp_seq),
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@ -2178,7 +2181,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
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/* Handle grace-period end. */
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rsp->gp_state = RCU_GP_CLEANUP;
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rcu_gp_cleanup(rsp);
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rcu_gp_cleanup();
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rsp->gp_state = RCU_GP_CLEANED;
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}
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}
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@ -3744,7 +3747,7 @@ static int __init rcu_spawn_gp_kthread(void)
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rcu_scheduler_fully_active = 1;
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for_each_rcu_flavor(rsp) {
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t = kthread_create(rcu_gp_kthread, rsp, "%s", rsp->name);
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t = kthread_create(rcu_gp_kthread, NULL, "%s", rsp->name);
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BUG_ON(IS_ERR(t));
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rnp = rcu_get_root();
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raw_spin_lock_irqsave_rcu_node(rnp, flags);
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