Merge branch 'use-standard-sysctl-macro'

Tonghao Zhang says:

====================
use standard sysctl macro

From: Tonghao Zhang <xiangxia.m.yue@gmail.com>

This patchset introduce sysctl macro or replace var
with macro.
====================

Link: https://lore.kernel.org/r/20220501035524.91205-1-xiangxia.m.yue@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>