linux-kernel - Re: [PATCH v4 7/8] sysctl: Refactor base paths registrations

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Date:   Tue, 23 May 2023 14:56:01 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Joel Granados <j.granados@...sung.com>
Cc:     mcgrof@...nel.org, Kees Cook <keescook@...omium.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Iurii Zaikin <yzaikin@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: Re: [PATCH v4 7/8] sysctl: Refactor base paths registrations

On Tue, May 23, 2023 at 02:22:19PM +0200, Joel Granados wrote:
> This is part of the general push to deprecate register_sysctl_paths and
> register_sysctl_table. The old way of doing this through
> register_sysctl_base and DECLARE_SYSCTL_BASE macro is replaced with a
> call to register_sysctl_init. The 5 base paths affected are: "kernel",
> "vm", "debug", "dev" and "fs".
> 
> We remove the register_sysctl_base function and the DECLARE_SYSCTL_BASE
> macro since they are no longer needed.
> 
> In order to quickly acertain that the paths did not actually change I
> executed `find /proc/sys/ | sha1sum` and made sure that the sha was the
> same before and after the commit.
> 
> We end up saving 563 bytes with this change:
> 
> ./scripts/bloat-o-meter vmlinux.0.base vmlinux.1.refactor-base-paths
> add/remove: 0/5 grow/shrink: 2/0 up/down: 77/-640 (-563)
> Function                                     old     new   delta
> sysctl_init_bases                             55     111     +56
> init_fs_sysctls                               12      33     +21
> vm_base_table                                128       -    -128
> kernel_base_table                            128       -    -128
> fs_base_table                                128       -    -128
> dev_base_table                               128       -    -128
> debug_base_table                             128       -    -128
> Total: Before=21258215, After=21257652, chg -0.00%
> 
> Signed-off-by: Joel Granados <j.granados@...sung.com>
> [mcgrof: modified to use register_sysctl_init() over register_sysctl()
>  and add bloat-o-meter stats]
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> Tested-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---

Acked-by: Christian Brauner <brauner@...nel.org>