Re: [PATCH] mm: memcontrol.c: move mem_cgroup_id_get_many under CONFIG_MMU

[Qian Cai]

> On Dec 17, 2019, at 9:46 AM, Michal Hocko <mhocko@xxxxxxxxxx> wrote:
> 
> yes, I would just ignore this warning. Btw. it seems that this is
> enabled by default for -Wall. Is this useful for kernel builds at
> all? Does it realistically help discovering real issues? If not then
> can we simply blacklist it?

-Wunused-function is useful in-general as it caught many dead code that some commits left unintentionally with real-world configs.