Re: [PATCH v7 1/3] memcontrol: define root_mem_cgroup for CONFIG_MEMCG=n cases

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On Fri 19-07-24 19:58:39, Qu Wenruo wrote:
> There is an incoming btrfs patchset, which will use @root_mem_cgroup as
> the active cgroup to attach metadata folios to its internal btree
> inode, so that btrfs can skip the possibly costly charge for the
> internal inode which is only accessible by btrfs itself.
> 
> However @root_mem_cgroup is not always defined (not defined for
> CONFIG_MEMCG=n case), thus all such callers need to do the extra
> handling for different CONFIG_MEMCG settings.
> 
> So here we add a special macro definition of root_mem_cgroup, making it
> to always be NULL.

Isn't just a declaration sufficient? Nothing should really dereference
the pointer anyway.

-- 
Michal Hocko
SUSE Labs




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