Hello, Uladzislau,
Here is where I placed that probe code and the corresponding output.
Where should I be placing it instead?
Thanx, Paul
------------------------------------------------------------------------
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 219b4b516f387..308cbc5e68a64 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -4546,8 +4546,17 @@ void rcu_scheduler_starting(void)
local_irq_restore(flags);
// Switch out of early boot mode.
+ pr_err("-> [%d] Invoke synchronize_rcu(): seq number: %lu\n", current->pid, get_state_synchronize_rcu());
+ synchronize_rcu();
+ pr_err("-> [%d] Done. A seq number: %lu\n", current->pid, get_state_synchronize_rcu());
rcu_scheduler_active = RCU_SCHEDULER_INIT;
+ pr_err("-> [%d] Invoke synchronize_rcu(): seq number: %lu\n", current->pid, get_state_synchronize_rcu());
+ synchronize_rcu();
+ pr_err("-> [%d] Done. A seq number: %lu\n", current->pid, get_state_synchronize_rcu());
rcu_test_sync_prims();
+ pr_err("-> [%d] Invoke synchronize_rcu(): seq number: %lu\n", current->pid, get_state_synchronize_rcu());
+ synchronize_rcu();
+ pr_err("-> [%d] Done. A seq number: %lu\n", current->pid, get_state_synchronize_rcu());
}
/*
@@ -4817,6 +4826,9 @@ void __init rcu_init(void)
kfree_rcu_batch_init();
rcu_bootup_announce();
+ pr_err("-> [%d] Invoke synchronize_rcu(): seq number: %lu\n", current->pid, get_state_synchronize_rcu());
+ synchronize_rcu();
+ pr_err("-> [%d] Done. A seq number: %lu\n", current->pid, get_state_synchronize_rcu());
sanitize_kthread_prio();
rcu_init_geometry();
rcu_init_one();
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 7b1e183b0eb23..2993be46f81d5 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -557,9 +557,12 @@ struct early_boot_kfree_rcu {
static void early_boot_test_call_rcu(void)
{
static struct rcu_head head;
+ int idx;
static struct rcu_head shead;
struct early_boot_kfree_rcu *rhp;
+ idx = srcu_down_read(&early_srcu);
+ srcu_up_read(&early_srcu, idx);
call_rcu(&head, test_callback);
early_srcu_cookie = start_poll_synchronize_srcu(&early_srcu);
call_srcu(&early_srcu, &shead, test_callback);
------------------------------------------------------------------------
[ 0.016333] rcu: -> [0] Invoke synchronize_rcu(): seq number: 12
[ 0.016334] rcu: -> [0] Done. A seq number: 16
[ 0.114209] rcu: -> [0] Invoke synchronize_rcu(): seq number: 32
[ 0.114662] rcu: -> [0] Done. A seq number: 36
[ 0.115191] rcu: -> [0] Invoke synchronize_rcu(): seq number: 36
[ 0.115684] rcu: -> [0] Done. A seq number: 40
[ 0.116046] rcu: -> [0] Invoke synchronize_rcu(): seq number: 48
[ 0.116202] rcu: -> [0] Done. A seq number: 52
