Disable inlining of cgroup css reference count functions

configname: CONFIG_DEBUG_CGROUP_REF

Linux Kernel Configuration
└─>Kernel hacking
└─>Disable inlining of cgroup css reference count functions
In linux kernel since version 6.2 (release Date: 2023-02-19)  
Force cgroup css reference count functions to not be inlined so
that they can be kprobed for debugging.

depends
CONFIG_CGROUPS
CONFIG_DEBUG_KERNEL
CONFIG_KPROBES