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rcu: Remove rsp parameter from no-CBs CPU functions 

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_nocb_cpu_needs_barrier(), rcu_spawn_one_nocb_kthread(),
rcu_organize_nocb_kthreads(), rcu_nocb_cpu_needs_barrier(), and
rcu_nohz_full_cpu().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-03 17:22:34 -07:00
parent b21ebed951
commit 4580b0541b
3 changed files with 14 additions and 14 deletions
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4
kernel/rcu/tree.c
View File

@ -3095,7 +3095,7 @@ static int rcu_pending(void)
check_cpu_stall(rdp);
/* Is this CPU a NO_HZ_FULL CPU that should ignore RCU? */
if (rcu_nohz_full_cpu(&rcu_state))
if (rcu_nohz_full_cpu())
return 0;
/* Is the RCU core waiting for a quiescent state from this CPU? */
@ -3246,7 +3246,7 @@ static void _rcu_barrier(void)
continue;
rdp = per_cpu_ptr(&rcu_data, cpu);
if (rcu_is_nocb_cpu(cpu)) {
if (!rcu_nocb_cpu_needs_barrier(rsp, cpu)) {
if (!rcu_nocb_cpu_needs_barrier(cpu)) {
_rcu_barrier_trace(TPS("OfflineNoCB"), cpu,
rsp->barrier_sequence);
} else {

6
kernel/rcu/tree.h
View File

@ -476,7 +476,7 @@ static void print_cpu_stall_info(int cpu);
static void print_cpu_stall_info_end(void);
static void zero_cpu_stall_ticks(struct rcu_data *rdp);
static void increment_cpu_stall_ticks(void);
static bool rcu_nocb_cpu_needs_barrier(struct rcu_state *rsp, int cpu);
static bool rcu_nocb_cpu_needs_barrier(int cpu);
static struct swait_queue_head *rcu_nocb_gp_get(struct rcu_node *rnp);
static void rcu_nocb_gp_cleanup(struct swait_queue_head *sq);
static void rcu_init_one_nocb(struct rcu_node *rnp);
@ -491,11 +491,11 @@ static void rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp);
static void rcu_spawn_all_nocb_kthreads(int cpu);
static void __init rcu_spawn_nocb_kthreads(void);
#ifdef CONFIG_RCU_NOCB_CPU
static void __init rcu_organize_nocb_kthreads(struct rcu_state *rsp);
static void __init rcu_organize_nocb_kthreads(void);
#endif /* #ifdef CONFIG_RCU_NOCB_CPU */
static bool init_nocb_callback_list(struct rcu_data *rdp);
static void rcu_bind_gp_kthread(void);
static bool rcu_nohz_full_cpu(struct rcu_state *rsp);
static bool rcu_nohz_full_cpu(void);
static void rcu_dynticks_task_enter(void);
static void rcu_dynticks_task_exit(void);

18
kernel/rcu/tree_plugin.h
View File

@ -1960,7 +1960,7 @@ static void wake_nocb_leader_defer(struct rcu_data *rdp, int waketype,
* Does the specified CPU need an RCU callback for the specified flavor
* of rcu_barrier()?
*/
static bool rcu_nocb_cpu_needs_barrier(struct rcu_state *rsp, int cpu)
static bool rcu_nocb_cpu_needs_barrier(int cpu)
{
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
unsigned long ret;
@ -2424,7 +2424,7 @@ 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(&rcu_data, cpu));
rcu_organize_nocb_kthreads(rsp);
rcu_organize_nocb_kthreads();
}
}
@ -2444,7 +2444,7 @@ static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp)
* brought online out of order, this can require re-organizing the
* leader-follower relationships.
*/
static void rcu_spawn_one_nocb_kthread(struct rcu_state *rsp, int cpu)
static void rcu_spawn_one_nocb_kthread(int cpu)
{
struct rcu_data *rdp;
struct rcu_data *rdp_last;
@ -2481,7 +2481,7 @@ static void rcu_spawn_one_nocb_kthread(struct rcu_state *rsp, int cpu)
/* Spawn the kthread for this CPU and RCU flavor. */
t = kthread_run(rcu_nocb_kthread, rdp_spawn,
"rcuo%c/%d", rsp->abbr, cpu);
"rcuo%c/%d", rcu_state.abbr, cpu);
BUG_ON(IS_ERR(t));
WRITE_ONCE(rdp_spawn->nocb_kthread, t);
}
@ -2496,7 +2496,7 @@ static void rcu_spawn_all_nocb_kthreads(int cpu)
if (rcu_scheduler_fully_active)
for_each_rcu_flavor(rsp)
rcu_spawn_one_nocb_kthread(rsp, cpu);
rcu_spawn_one_nocb_kthread(cpu);
}
/*
@ -2520,7 +2520,7 @@ module_param(rcu_nocb_leader_stride, int, 0444);
/*
* Initialize leader-follower relationships for all no-CBs CPU.
*/
static void __init rcu_organize_nocb_kthreads(struct rcu_state *rsp)
static void __init rcu_organize_nocb_kthreads(void)
{
int cpu;
int ls = rcu_nocb_leader_stride;
@ -2579,7 +2579,7 @@ static bool init_nocb_callback_list(struct rcu_data *rdp)
#else /* #ifdef CONFIG_RCU_NOCB_CPU */
static bool rcu_nocb_cpu_needs_barrier(struct rcu_state *rsp, int cpu)
static bool rcu_nocb_cpu_needs_barrier(int cpu)
{
WARN_ON_ONCE(1); /* Should be dead code. */
return false;
@ -2648,12 +2648,12 @@ static bool init_nocb_callback_list(struct rcu_data *rdp)
* This code relies on the fact that all NO_HZ_FULL CPUs are also
* CONFIG_RCU_NOCB_CPU CPUs.
*/
static bool rcu_nohz_full_cpu(struct rcu_state *rsp)
static bool rcu_nohz_full_cpu(void)
{
#ifdef CONFIG_NO_HZ_FULL
if (tick_nohz_full_cpu(smp_processor_id()) &&
(!rcu_gp_in_progress() ||
ULONG_CMP_LT(jiffies, READ_ONCE(rsp->gp_start) + HZ)))
ULONG_CMP_LT(jiffies, READ_ONCE(rcu_state.gp_start) + HZ)))
return true;
#endif /* #ifdef CONFIG_NO_HZ_FULL */
return false;