On Fri, Sep 11, 2026 at 12:02:51PM +0800, Kunwu Chan wrote:
> Atomic SRCU does not use the srcu_node combining tree. Exclude it
> from the SRCU_SIZING_IS_TORTURE() transition in
> srcu_torture_stats_print(), and warn if such a transition is requested.
>
> Signed-off-by: Kunwu Chan <[email protected]>
Queued for testing and review, thank you!
Thanx, Paul
> ---
> Changes:
> -add warn on an invalid atomic SRCU sizing configuration.
> -v1:
> https://lore.kernel.org/rcu/[email protected]/
> ---
> kernel/rcu/srcutree.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
> index 68441c32cebf..60c102a4d057 100644
> --- a/kernel/rcu/srcutree.c
> +++ b/kernel/rcu/srcutree.c
> @@ -2422,8 +2422,10 @@ void srcu_torture_stats_print(struct srcu_struct *ssp,
> char *tt, char *tf)
> }
> pr_cont(" T(%ld,%ld)\n", s0, s1);
> }
> - if (SRCU_SIZING_IS_TORTURE())
> - srcu_transition_to_big(ssp);
> + if (SRCU_SIZING_IS_TORTURE()) {
> + if (!WARN_ON_ONCE(ssp->srcu_reader_flavor ==
> SRCU_READ_FLAVOR_ATOMIC))
> + srcu_transition_to_big(ssp);
> + }
> }
> EXPORT_SYMBOL_GPL(srcu_torture_stats_print);
>
> --
> 2.43.0
>
