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rcu/nocb: Move rcu_nocb_is_setup to rcu_state

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This commit moves the RCU nocb initialization witness within rcu_state
to consolidate RCU's global state.

Reported-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Uladzislau Rezki <uladzislau.rezki@sony.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Frederic Weisbecker 2022-02-14 14:23:39 +01:00 committed by Paul E. McKenney
parent beb84099f1
commit 8d2aaa9b7c
2 changed files with 6 additions and 8 deletions
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1
kernel/rcu/tree.h
View File

@ -364,6 +364,7 @@ struct rcu_state {
arch_spinlock_t ofl_lock ____cacheline_internodealigned_in_smp;
/* Synchronize offline with */
/* GP pre-initialization. */
int nocb_is_setup; /* nocb is setup from boot */
};
/* Values for rcu_state structure's gp_flags field. */

13
kernel/rcu/tree_nocb.h
View File

@ -60,9 +60,6 @@ static inline bool rcu_current_is_nocb_kthread(struct rcu_data *rdp)
* Parse the boot-time rcu_nocb_mask CPU list from the kernel parameters.
* If the list is invalid, a warning is emitted and all CPUs are offloaded.
*/
static bool rcu_nocb_is_setup;
static int __init rcu_nocb_setup(char *str)
{
alloc_bootmem_cpumask_var(&rcu_nocb_mask);
@ -72,7 +69,7 @@ static int __init rcu_nocb_setup(char *str)
cpumask_setall(rcu_nocb_mask);
}
}
rcu_nocb_is_setup = true;
rcu_state.nocb_is_setup = true;
return 1;
}
__setup("rcu_nocbs", rcu_nocb_setup);
@ -1172,10 +1169,10 @@ void __init rcu_init_nohz(void)
return;
}
}
rcu_nocb_is_setup = true;
rcu_state.nocb_is_setup = true;
}
if (!rcu_nocb_is_setup)
if (!rcu_state.nocb_is_setup)
return;
#if defined(CONFIG_NO_HZ_FULL)
@ -1233,7 +1230,7 @@ static void rcu_spawn_cpu_nocb_kthread(int cpu)
struct task_struct *t;
struct sched_param sp;
if (!rcu_scheduler_fully_active || !rcu_nocb_is_setup)
if (!rcu_scheduler_fully_active || !rcu_state.nocb_is_setup)
return;
/* If there already is an rcuo kthread, then nothing to do. */
@ -1279,7 +1276,7 @@ static void __init rcu_spawn_nocb_kthreads(void)
{
int cpu;
if (rcu_nocb_is_setup) {
if (rcu_state.nocb_is_setup) {
for_each_online_cpu(cpu)
rcu_spawn_cpu_nocb_kthread(cpu);
}