linux-kernel - Re: [PATCH v2 00/14] sysctl: Add a size argument to register functions in sysctl

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Message-ID: <ZMgeoDT0t3NeALM0@bombadil.infradead.org>
Date:   Mon, 31 Jul 2023 13:50:40 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Joel Granados <joel.granados@...il.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
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        Joel Granados <j.granados@...sung.com>
Subject: Re: [PATCH v2 00/14] sysctl: Add a size argument to register
 functions in sysctl

On Mon, Jul 31, 2023 at 09:17:14AM +0200, Joel Granados wrote:
> Why?

It would be easier to read if the what went before the why.

> This is a preparation patch set that will make it easier for us to apply
> subsequent patches that will remove the sentinel element (last empty element)
> in the ctl_table arrays.
> 
> In itself, it does not remove any sentinels but it is needed to bring all the
> advantages of the removal to fruition which is to help reduce the overall build
> time size of the kernel and run time memory bloat by about ~64 bytes per
> sentinel.

s/sentinel/declared ctl array

Because the you're suggesting we want to remove the sentinel but we
want to help the patch reviewer know that a sentil is required per
declared ctl array.

You can also mention here briefly that this helps ensure that future moves of
sysctl arrays out from kernel/sysctl.c to their own subsystem won't
penalize in enlarging the kernel build size or run time memory consumption.

Thanks for spinning this up again!

  Luis