linux-kernel - Re: [PATCH v2 1/2] sysctl: remove empty dev table

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Message-ID: <20230529200457.a42hwn7cq6np5ur4@localhost>
Date:   Mon, 29 May 2023 22:04:57 +0200
From:   Joel Granados <j.granados@...sung.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
CC:     <keescook@...omium.org>, <yzaikin@...gle.com>,
        <ebiederm@...ssion.com>, <dave.hansen@...el.com>, <arnd@...db.de>,
        <bp@...en8.de>, <James.Bottomley@...senPartnership.com>,
        <deller@....de>, <tglx@...utronix.de>, <mingo@...hat.com>,
        <x86@...nel.org>, <hpa@...or.com>, <luto@...nel.org>,
        <peterz@...radead.org>, <brgerst@...il.com>,
        <christophe.jaillet@...adoo.fr>, <kirill.shutemov@...ux.intel.com>,
        <jroedel@...e.de>, <akpm@...ux-foundation.org>,
        <willy@...radead.org>, <linux-parisc@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] sysctl: remove empty dev table

On Fri, May 26, 2023 at 03:22:05PM -0700, Luis Chamberlain wrote:
> Now that all the dev sysctls have been moved out we can remove the
> dev sysctl base directory. We don't need to create base directories,
> they are created for you as if using 'mkdir -p' with register_syctl()
> and register_sysctl_init(). For details refer to sysctl_mkdir_p()
> usage.
> 
> We save 90 bytes with this changes:
> 
> ./scripts/bloat-o-meter vmlinux.2.remove-sysctl-table vmlinux.3-remove-dev-table
> add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-90 (-90)
> Function                                     old     new   delta
> sysctl_init_bases                            111      85     -26
> dev_table                                     64       -     -64
> Total: Before=21257057, After=21256967, chg -0.00%
> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>  kernel/sysctl.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index fa2aa8bd32b6..a7fdb828afb6 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -2344,16 +2344,11 @@ static struct ctl_table debug_table[] = {
>  	{ }
>  };
>  
> -static struct ctl_table dev_table[] = {
> -	{ }
> -};
> -
>  int __init sysctl_init_bases(void)
>  {
>  	register_sysctl_init("kernel", kern_table);
>  	register_sysctl_init("vm", vm_table);
>  	register_sysctl_init("debug", debug_table);
> -	register_sysctl_init("dev", dev_table);
>  
>  	return 0;
>  }
> -- 
> 2.39.2
> 
LGTM.

Review
But why was dev there to begin with?

Best

-- 

Joel Granados

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