linux-kernel - Re: [PATCH v7 5/8] sched/topology: Unify tl_smt

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Message-ID: <20250826080123.GB3245006@noisy.programming.kicks-ass.net>
Date: Tue, 26 Aug 2025 10:01:23 +0200
From: Peter Zijlstra <peterz@...radead.org>
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Subject: Re: [PATCH v7 5/8] sched/topology: Unify tl_smt_mask() across core
 and all arch

> diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
> index 602508130c8a..d75fbb7d9667 100644
> --- a/include/linux/sched/topology.h
> +++ b/include/linux/sched/topology.h
> @@ -37,7 +37,13 @@ static inline int cpu_smt_flags(void)
>  {
>  	return SD_SHARE_CPUCAPACITY | SD_SHARE_LLC;
>  }
> -#endif
> +
> +static const __maybe_unused
> +struct cpumask *tl_smt_mask(struct sched_domain_topology_level *tl, int cpu)
> +{
> +	return cpu_smt_mask(cpu);
> +}
> +#endif /* CONFIG_SCHED_SMT */

Problem with that __maybe_unused is that you forgot inline.

static inline const
struct cpumask *tl_smt_mask(struct sched_domain_topology_level *tl, int cpu)
{
	return cpu_smt_mask(cpu);
}

seems to make it happy.