linux-kernel - Re: [tip: sched/core] sched: Make struct sched_statistics independent of fair sched class

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Message-ID: <20210921061727.GA24828@kili>
Date:   Tue, 21 Sep 2021 09:17:27 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-tip-commits@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>, x86@...nel.org
Subject: Re: [tip: sched/core] sched: Make struct sched_statistics
 independent of fair sched class

On Thu, Sep 16, 2021 at 11:59:30AM -0000, tip-bot2 for Yafang Shao wrote:
> @@ -11424,7 +11441,7 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
>  		if (!cfs_rq)
>  			goto err;
>  
> -		se = kzalloc_node(sizeof(struct sched_entity),
> +		se = kzalloc_node(sizeof(struct sched_entity_stats),

This wasn't there in the original patch and it causes a Smatch warning
because "se" is declared as a "sched_entity" but it's allocating a
larger "sched_entity_stats" which contains a sched_entity.

To me, ideally, we would update the type of se.

>  				  GFP_KERNEL, cpu_to_node(i));
>  		if (!se)
>  			goto err_free_rq;

regards,
dan carpenter