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

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Message-Id: <20230526222207.982107-2-mcgrof@kernel.org>
Date:   Fri, 26 May 2023 15:22:05 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     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
Cc:     j.granados@...sung.com, akpm@...ux-foundation.org,
        willy@...radead.org, linux-parisc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH v2 1/2] sysctl: remove empty dev table

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