linux-kernel - Re: [PATCH 03/10] ftrace: Remove the now superfluous sentinel elements from ctl

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Date:   Wed, 8 Nov 2023 19:29:49 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     <j.granados@...sung.com>
Cc:     Joel Granados via B4 Relay 
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Subject: Re: [PATCH 03/10] ftrace: Remove the now superfluous sentinel
 elements from ctl_table array

On Tue, 07 Nov 2023 14:45:03 +0100
Joel Granados via B4 Relay <devnull+j.granados.samsung.com@...nel.org> wrote:

> From: Joel Granados <j.granados@...sung.com>
> 
> This commit comes at the tail end of a greater effort to remove the
> empty elements at the end of the ctl_table arrays (sentinels) which
> will reduce the overall build time size of the kernel and run time
> memory bloat by ~64 bytes per sentinel (further information Link :
> https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)
> 
> Remove sentinel elements from ftrace_sysctls and user_event_sysctls
> 

Both looks good to me. (since register_sysctl_init() uses ARRAY_SIZE()
macro to get the array size.)

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

> Signed-off-by: Joel Granados <j.granados@...sung.com>
> ---
>  kernel/trace/ftrace.c            | 1 -
>  kernel/trace/trace_events_user.c | 1 -
>  2 files changed, 2 deletions(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 8de8bec5f366..fd40d02a23c7 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -8264,7 +8264,6 @@ static struct ctl_table ftrace_sysctls[] = {
>  		.mode           = 0644,
>  		.proc_handler   = ftrace_enable_sysctl,
>  	},
> -	{}
>  };
>  
>  static int __init ftrace_sysctl_init(void)
> diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
> index 6f046650e527..bef1bdc62acf 100644
> --- a/kernel/trace/trace_events_user.c
> +++ b/kernel/trace/trace_events_user.c
> @@ -2694,7 +2694,6 @@ static struct ctl_table user_event_sysctls[] = {
>  		.mode		= 0644,
>  		.proc_handler	= set_max_user_events_sysctl,
>  	},
> -	{}
>  };
>  
>  static int __init trace_events_user_init(void)
> 
> -- 
> 2.30.2
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>