linux-kernel - Re: [PATCH] sched/features: Expand the space of sched features

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Date:   Mon, 1 Aug 2022 14:46:35 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Cruz Zhao <CruzZhao@...ux.alibaba.com>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/features: Expand the space of sched features


* Cruz Zhao <CruzZhao@...ux.alibaba.com> wrote:

> With the increase of sched features, the available space decreases
> gradually. In order to prevent features overflow, this patch expands
> the space of sched features from 32 to 64.
> 
> Signed-off-by: Cruz Zhao <CruzZhao@...ux.alibaba.com>
> ---
>  kernel/sched/core.c  | 2 +-
>  kernel/sched/sched.h | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 1899990..afe76fb 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -122,7 +122,7 @@
>   */
>  #define SCHED_FEAT(name, enabled)	\
>  	(1UL << __SCHED_FEAT_##name) * enabled |
> -const_debug unsigned int sysctl_sched_features =
> +const_debug u64 sysctl_sched_features =


Have you run into this? We have 27 features listed, so this shouldn't be 
happening right now - and this patch just bloats the word for no good 
reason.

Also, doesn't it generate a build warning/error in that case?

Thanks,

	Ingo