linux-kernel - Re: [tip: sched/core] sched/topology: Introduce sched

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Message-ID: <20230523105935.GN83892@hirez.programming.kicks-ass.net>
Date:   Tue, 23 May 2023 12:59:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-tip-commits@...r.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Len Brown <len.brown@...el.com>,
        Vincent Guittot <vincent.guittot@...aro.org>, x86@...nel.org
Subject: Re: [tip: sched/core] sched/topology: Introduce sched_group::flags

On Tue, Oct 05, 2021 at 02:12:02PM -0000, tip-bot2 for Ricardo Neri wrote:

> index 4e8698e..c56faae 100644
> --- a/kernel/sched/topology.c
> +++ b/kernel/sched/topology.c
> @@ -716,8 +716,20 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
>  		tmp = sd;
>  		sd = sd->parent;
>  		destroy_sched_domain(tmp);
> -		if (sd)
> +		if (sd) {
> +			struct sched_group *sg = sd->groups;
> +
> +			/*
> +			 * sched groups hold the flags of the child sched
> +			 * domain for convenience. Clear such flags since
> +			 * the child is being destroyed.
> +			 */
> +			do {
> +				sg->flags = 0;
> +			} while (sg != sd->groups);


I happened to be reading this here code and aren't we missing:

	sg = sg->next;

somewhere in that loop?