diff options
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 23685407dcf6..54963f8c244c 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4305,7 +4305,6 @@ int rcutree_prepare_cpu(unsigned int cpu) */ rnp = rdp->mynode; raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */ - rdp->beenonline = true; /* We have now been online. */ rdp->gp_seq = READ_ONCE(rnp->gp_seq); rdp->gp_seq_needed = rdp->gp_seq; rdp->cpu_no_qs.b.norm = true; @@ -4333,6 +4332,16 @@ static void rcutree_affinity_setting(unsigned int cpu, int outgoing) } /* + * Has the specified (known valid) CPU ever been fully online? + */ +bool rcu_cpu_beenfullyonline(int cpu) +{ + struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu); + + return smp_load_acquire(&rdp->beenonline); +} + +/* * Near the end of the CPU-online process. Pretty much all services * enabled, and the CPU is now very much alive. */ @@ -4435,6 +4444,7 @@ void rcu_cpu_starting(unsigned int cpu) raw_spin_unlock_rcu_node(rnp); } arch_spin_unlock(&rcu_state.ofl_lock); + smp_store_release(&rdp->beenonline, true); smp_mb(); /* Ensure RCU read-side usage follows above initialization. */ } |