On Mon, Nov 08, 2021 at 11:11:35AM +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@xxxxxxx>
>
> Avoid homegrown notifier registration checks.
>
> No functional changes.
>
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Or I would be happy to take this as soon as the first patch appears
somewhere that I can base off of. (I could duplicate it in -rcu, I
suppose.)
Thanx, Paul
> Cc: rcu@xxxxxxxxxxxxxxx
> ---
> kernel/rcu/tree_stall.h | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
> index 5e2fa6fd97f1..0c1d631214f4 100644
> --- a/kernel/rcu/tree_stall.h
> +++ b/kernel/rcu/tree_stall.h
> @@ -101,7 +101,9 @@ static struct notifier_block rcu_panic_block = {
>
> static int __init check_cpu_stall_init(void)
> {
> - atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block);
> + if (atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block))
> + pr_warn("RCU warning suppress notifier already registered\n");
> +
> return 0;
> }
> early_initcall(check_cpu_stall_init);
> --
> 2.29.2
>
