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rcu: Remove rcu_state structure's ->rda field

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The rcu_state structure's ->rda field was used to find the per-CPU
rcu_data structures corresponding to that rcu_state structure.  But now
there is only one rcu_state structure (creatively named "rcu_state")
and one set of per-CPU rcu_data structures (creatively named "rcu_data").
Therefore, uses of the ->rda field can always be replaced by "rcu_data,
and this commit makes that change and removes the ->rda field.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-07-03 15:37:16 -07:00
parent ec5dd444b6
commit da1df50d16
4 changed files with 54 additions and 57 deletions
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24
kernel/rcu/tree_plugin.h
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@@ -328,7 +328,7 @@ static void rcu_qs(void)
void rcu_note_context_switch(bool preempt)
{
struct task_struct *t = current;
struct rcu_data *rdp = this_cpu_ptr(rcu_state_p->rda);
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
struct rcu_node *rnp;
barrier(); /* Avoid RCU read-side critical sections leaking down. */
@@ -488,7 +488,7 @@ rcu_preempt_deferred_qs_irqrestore(struct task_struct *t, unsigned long flags)
* t->rcu_read_unlock_special cannot change.
*/
special = t->rcu_read_unlock_special;
rdp = this_cpu_ptr(rcu_state_p->rda);
rdp = this_cpu_ptr(&rcu_data);
if (!special.s && !rdp->deferred_qs) {
local_irq_restore(flags);
return;
@@ -911,7 +911,7 @@ dump_blkd_tasks(struct rcu_state *rsp, struct rcu_node *rnp, int ncheck)
}
pr_cont("\n");
for (cpu = rnp->grplo; cpu <= rnp->grphi; cpu++) {
rdp = per_cpu_ptr(rsp->rda, cpu);
rdp = per_cpu_ptr(&rcu_data, cpu);
onl = !!(rdp->grpmask & rcu_rnp_online_cpus(rnp));
pr_info("\t%d: %c online: %ld(%d) offline: %ld(%d)\n",
cpu, ".o"[onl],
@@ -1437,7 +1437,7 @@ static void __init rcu_spawn_boost_kthreads(void)
static void rcu_prepare_kthreads(int cpu)
{
struct rcu_data *rdp = per_cpu_ptr(rcu_state_p->rda, cpu);
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
struct rcu_node *rnp = rdp->mynode;
/* Fire up the incoming CPU's kthread and leaf rcu_node kthread. */
@@ -1574,7 +1574,7 @@ static bool __maybe_unused rcu_try_advance_all_cbs(void)
rdtp->last_advance_all = jiffies;
for_each_rcu_flavor(rsp) {
rdp = this_cpu_ptr(rsp->rda);
rdp = this_cpu_ptr(&rcu_data);
rnp = rdp->mynode;
/*
@@ -1692,7 +1692,7 @@ static void rcu_prepare_for_idle(void)
return;
rdtp->last_accelerate = jiffies;
for_each_rcu_flavor(rsp) {
rdp = this_cpu_ptr(rsp->rda);
rdp = this_cpu_ptr(&rcu_data);
if (!rcu_segcblist_pend_cbs(&rdp->cblist))
continue;
rnp = rdp->mynode;
@@ -1778,7 +1778,7 @@ static void print_cpu_stall_info(struct rcu_state *rsp, int cpu)
{
unsigned long delta;
char fast_no_hz[72];
struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
struct rcu_dynticks *rdtp = rdp->dynticks;
char *ticks_title;
unsigned long ticks_value;
@@ -1833,7 +1833,7 @@ static void increment_cpu_stall_ticks(void)
struct rcu_state *rsp;
for_each_rcu_flavor(rsp)
raw_cpu_inc(rsp->rda->ticks_this_gp);
raw_cpu_inc(rcu_data.ticks_this_gp);
}
#ifdef CONFIG_RCU_NOCB_CPU
@@ -1965,7 +1965,7 @@ static void wake_nocb_leader_defer(struct rcu_data *rdp, int waketype,
*/
static bool rcu_nocb_cpu_needs_barrier(struct rcu_state *rsp, int cpu)
{
struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
unsigned long ret;
#ifdef CONFIG_PROVE_RCU
struct rcu_head *rhp;
@@ -2426,7 +2426,7 @@ void __init rcu_init_nohz(void)
for_each_rcu_flavor(rsp) {
for_each_cpu(cpu, rcu_nocb_mask)
init_nocb_callback_list(per_cpu_ptr(rsp->rda, cpu));
init_nocb_callback_list(per_cpu_ptr(&rcu_data, cpu));
rcu_organize_nocb_kthreads(rsp);
}
}
@@ -2452,7 +2452,7 @@ static void rcu_spawn_one_nocb_kthread(struct rcu_state *rsp, int cpu)
struct rcu_data *rdp;
struct rcu_data *rdp_last;
struct rcu_data *rdp_old_leader;
struct rcu_data *rdp_spawn = per_cpu_ptr(rsp->rda, cpu);
struct rcu_data *rdp_spawn = per_cpu_ptr(&rcu_data, cpu);
struct task_struct *t;
/*
@@ -2545,7 +2545,7 @@ static void __init rcu_organize_nocb_kthreads(struct rcu_state *rsp)
* we will spawn the needed set of rcu_nocb_kthread() kthreads.
*/
for_each_cpu(cpu, rcu_nocb_mask) {
rdp = per_cpu_ptr(rsp->rda, cpu);
rdp = per_cpu_ptr(&rcu_data, cpu);
if (rdp->cpu >= nl) {
/* New leader, set up for followers & next leader. */
nl = DIV_ROUND_UP(rdp->cpu + 1, ls) * ls;