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srcu: Early test SRCU polling start

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Place an early call to start_poll_synchronize_srcu() before the invocation
of call_srcu() on the same srcu_struct structure.

After the later call to srcu_barrier(), the completion of the
first grace period should be visible to a subsequent invocation of
poll_state_synchronize_srcu(), and if not, warn.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Uladzislau Rezki <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Frederic Weisbecker 2021-04-14 15:24:13 +02:00 committed by Paul E. McKenney
parent b5befe842e
commit 0a580fa65c
1 changed files with 5 additions and 1 deletions
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6
kernel/rcu/update.c
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@ -524,6 +524,7 @@ static void test_callback(struct rcu_head *r)
} }
DEFINE_STATIC_SRCU(early_srcu); DEFINE_STATIC_SRCU(early_srcu);
static unsigned long early_srcu_cookie;
struct early_boot_kfree_rcu { struct early_boot_kfree_rcu {
struct rcu_head rh; struct rcu_head rh;
@ -536,8 +537,10 @@ static void early_boot_test_call_rcu(void)
struct early_boot_kfree_rcu *rhp; struct early_boot_kfree_rcu *rhp;
call_rcu(&head, test_callback); call_rcu(&head, test_callback);
if (IS_ENABLED(CONFIG_SRCU)) if (IS_ENABLED(CONFIG_SRCU)) {
early_srcu_cookie = start_poll_synchronize_srcu(&early_srcu);
call_srcu(&early_srcu, &shead, test_callback); call_srcu(&early_srcu, &shead, test_callback);
}
rhp = kmalloc(sizeof(*rhp), GFP_KERNEL); rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
if (!WARN_ON_ONCE(!rhp)) if (!WARN_ON_ONCE(!rhp))
kfree_rcu(rhp, rh); kfree_rcu(rhp, rh);
@ -563,6 +566,7 @@ static int rcu_verify_early_boot_tests(void)
if (IS_ENABLED(CONFIG_SRCU)) { if (IS_ENABLED(CONFIG_SRCU)) {
early_boot_test_counter++; early_boot_test_counter++;
srcu_barrier(&early_srcu); srcu_barrier(&early_srcu);
WARN_ON_ONCE(!poll_state_synchronize_srcu(&early_srcu, early_srcu_cookie));
} }
} }
if (rcu_self_test_counter != early_boot_test_counter) { if (rcu_self_test_counter != early_boot_test_counter) {