linux-kernel - Re: [PATCH v2] sched: Simplify __sched

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Date:   Sun, 13 Feb 2022 04:45:48 +0800
From:   Huichun Feng <foxhoundsk.tw@...il.com>
To:     henrybear327@...il.com
Cc:     bristot@...hat.com, bsegall@...gle.com, christian@...uner.io,
        dietmar.eggemann@....com, juri.lelli@...hat.com,
        linux-kernel@...r.kernel.org, mgorman@...e.de, mingo@...hat.com,
        peterz@...radead.org, rostedt@...dmis.org,
        vincent.guittot@...aro.org
Subject: Re: [PATCH v2] sched: Simplify __sched_init runtime checks

Chun-Hung Tseng <henrybear327@...il.com> writes:

>
> Improve runtime checks in __sched_init(void) by replacing if conditional
> checks with preprocessor directives.
>
> Signed-off-by: Chun-Hung Tseng <henrybear327@...il.com>

Sorry, I didn't reply properly.

Signed-off-by: Huichun Feng <foxhoundsk.tw@...il.com>

> ---
>  kernel/sched/core.c | 29 +++++++++++++++--------------
>  1 file changed, 15 insertions(+), 14 deletions(-)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 848eaa0efe0e..1b27ca7f485a 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -9308,28 +9308,29 @@ void __init sched_init(void)
>  #ifdef CONFIG_RT_GROUP_SCHED
>         ptr += 2 * nr_cpu_ids * sizeof(void **);
>  #endif
> -       if (ptr) {
> -               ptr = (unsigned long)kzalloc(ptr, GFP_NOWAIT);
> +
> +#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)
> +       ptr = (unsigned long)kzalloc(ptr, GFP_NOWAIT);
>
>  #ifdef CONFIG_FAIR_GROUP_SCHED
> -               root_task_group.se = (struct sched_entity **)ptr;
> -               ptr += nr_cpu_ids * sizeof(void **);
> +       root_task_group.se = (struct sched_entity **)ptr;
> +       ptr += nr_cpu_ids * sizeof(void **);
>
> -               root_task_group.cfs_rq = (struct cfs_rq **)ptr;
> -               ptr += nr_cpu_ids * sizeof(void **);
> +       root_task_group.cfs_rq = (struct cfs_rq **)ptr;
> +       ptr += nr_cpu_ids * sizeof(void **);
>
> -               root_task_group.shares = ROOT_TASK_GROUP_LOAD;
> -               init_cfs_bandwidth(&root_task_group.cfs_bandwidth);
> +       root_task_group.shares = ROOT_TASK_GROUP_LOAD;
> +       init_cfs_bandwidth(&root_task_group.cfs_bandwidth);
>  #endif /* CONFIG_FAIR_GROUP_SCHED */
>  #ifdef CONFIG_RT_GROUP_SCHED
> -               root_task_group.rt_se = (struct sched_rt_entity **)ptr;
> -               ptr += nr_cpu_ids * sizeof(void **);
> -
> -               root_task_group.rt_rq = (struct rt_rq **)ptr;
> -               ptr += nr_cpu_ids * sizeof(void **);
> +       root_task_group.rt_se = (struct sched_rt_entity **)ptr;
> +       ptr += nr_cpu_ids * sizeof(void **);
>
> +       root_task_group.rt_rq = (struct rt_rq **)ptr;
> +       ptr += nr_cpu_ids * sizeof(void **);
>  #endif /* CONFIG_RT_GROUP_SCHED */
> -       }
> +#endif /* CONFIG_FAIR_GROUP_SCHED || CONFIG_RT_GROUP_SCHED */
> +
>  #ifdef CONFIG_CPUMASK_OFFSTACK
>         for_each_possible_cpu(i) {
>                 per_cpu(load_balance_mask, i) = (cpumask_var_t)kzalloc_node(
> --
> 2.34.1