linux-kernel - Re: [PATCH v3 1/2] fs/proc: optimize exactly register one ctl

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Message-ID: <Yh/0lYpuaYyXEq9u@bombadil.infradead.org>
Date:   Wed, 2 Mar 2022 14:49:57 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Meng Tang <tangmeng@...ontech.com>
Cc:     keescook@...omium.org, yzaikin@...gle.com, ebiederm@...ssion.com,
        willy@...radead.org, nixiaoming@...wei.com, nizhen@...ontech.com,
        zhanglianjie@...ontech.com, sujiaxun@...ontech.com,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] fs/proc: optimize exactly register one ctl_table

On Wed, Mar 02, 2022 at 10:55:10AM +0800, Meng Tang wrote:
> Sysctls are being moved out of kernel/sysctl.c and out to
> their own respective subsystems / users to help with easier
> maintance and avoid merge conflicts. But when we move just
> one entry and to its own new file the last entry for this
> new file must be empty, so we are essentialy bloating the
> kernel one extra empty entry per each newly moved sysctl.
> 
> To help with this, this adds support for registering just
> one ctl_table, therefore not bloating the kernel when we
> move a single ctl_table to its own file.
> 
> Since the process of registering just one single table is the
> same as that of registering an array table, so the code is
> similar to registering an array table. The difference between
> registering just one table and registering an array table is
> that we no longer traversal through pointers when registering
> a single table. These lead to that we have to add a complete
> implementation process for register just one ctl_table, so we
> have to add so much code.
> 
> Suggested-by: Matthew Wilcox <willy@...radead.org>
> Signed-off-by: Meng Tang <tangmeng@...ontech.com>

Is there really no helpers which you can add to share code?
Now that you did this work, look carefully.

  Luis