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SubjectRe: [PATCH] [23/31] HWPOISON: add memory cgroup filter
> I have a question, can try_get_mem_cgroup_from_page() return
> root_mem_cgroup?

It could be called for any page.

> if it can, then css->cgroup->dentry is NULL, if memcg is
> not mounted and there is no subdir in memcg. Because the root
> cgroup of an inactive subsystem has no dentry.

Thanks. I'll just add an return -EINVAL for this case, sounds good?


-- -- Speaking for myself only.

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