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rcu: Test synchronous RCU grace periods at the end of rcu_init()

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This commit tests synchronize_rcu() and synchronize_rcu_expedited()
at the end of rcu_init(), in addition to the test already at the
beginning of that function.  These tests are run only in kernels built
with CONFIG_PROVE_RCU=y.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-12-19 17:02:20 -08:00
parent 3d1adf7ada
commit 748bf47a89
2 changed files with 3 additions and 0 deletions
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2
kernel/rcu/tree.c
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@ -4849,6 +4849,8 @@ void __init rcu_init(void)
// Kick-start any polled grace periods that started early.
if (!(per_cpu_ptr(&rcu_data, cpu)->mynode->exp_seq_poll_rq & 0x1))
(void)start_poll_synchronize_rcu_expedited();
rcu_test_sync_prims();
}
#include "tree_stall.h"

1
kernel/rcu/update.c
View file

@ -220,6 +220,7 @@ void rcu_test_sync_prims(void)
{
if (!IS_ENABLED(CONFIG_PROVE_RCU))
return;
pr_info("Running RCU synchronous self tests\n");
synchronize_rcu();
synchronize_rcu_expedited();
}