On Mon, Jan 30, 2023 at 2:12 AM Zqiang <qiang1.zhang@xxxxxxxxx> wrote:
>
> The rcu-lazy shrinker is registered without CONFIG_RCU_LAZY enabled
> is meaningless, this commit therefore make rcu-lazy shrinker is
> registered only when CONFIG_RCU_LAZY is enabled.
>
> Signed-off-by: Zqiang <qiang1.zhang@xxxxxxxxx>
Reviewed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Thanks.
> ---
> kernel/rcu/tree_nocb.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
> index 9e1c8caec5ce..28c1c092817b 100644
> --- a/kernel/rcu/tree_nocb.h
> +++ b/kernel/rcu/tree_nocb.h
> @@ -1312,6 +1312,7 @@ int rcu_nocb_cpu_offload(int cpu)
> }
> EXPORT_SYMBOL_GPL(rcu_nocb_cpu_offload);
>
> +#ifdef CONFIG_RCU_LAZY
> static unsigned long
> lazy_rcu_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
> {
> @@ -1360,6 +1361,7 @@ static struct shrinker lazy_rcu_shrinker = {
> .batch = 0,
> .seeks = DEFAULT_SEEKS,
> };
> +#endif
>
> void __init rcu_init_nohz(void)
> {
> @@ -1391,8 +1393,10 @@ void __init rcu_init_nohz(void)
> if (!rcu_state.nocb_is_setup)
> return;
>
> +#ifdef CONFIG_RCU_LAZY
> if (register_shrinker(&lazy_rcu_shrinker, "rcu-lazy"))
> pr_err("Failed to register lazy_rcu shrinker!\n");
> +#endif
>
> if (!cpumask_subset(rcu_nocb_mask, cpu_possible_mask)) {
> pr_info("\tNote: kernel parameter 'rcu_nocbs=', 'nohz_full', or 'isolcpus=' contains nonexistent CPUs.\n");
> --
> 2.25.1
>
