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

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Message-ID: <ZHYnXKb8g0zSJe7+@bombadil.infradead.org>
Date:   Tue, 30 May 2023 09:42:04 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Joel Granados <j.granados@...sung.com>
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 Mon, May 29, 2023 at 10:04:57PM +0200, Joel Granados wrote:
> 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.

BTW, please use proper tags like Reviewed-by, and so on even if you use
LGTM so that then if anyone uses things like b4 it can pick the tags for
you.

> But why was dev there to begin with?

I will enhance the commit log to mention that, it was there because
old APIs didn't create the directory for you, and now it is clear it
is not needed. I checked ant he dev table was there since the beginning
of sysctl.c on v2.5.0.

  Luis