Re: [PATCH v2 1/2] mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg

[Michal Hocko]

On Tue 09-03-21 09:37:29, Balbir Singh wrote:
> On 4/3/21 6:40 pm, Zhou Guanghui wrote:
[...]
> > -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> >  /*
> > - * Because page_memcg(head) is not set on compound tails, set it now.
> > + * Because page_memcg(head) is not set on tails, set it now.
> >   */
> > -void mem_cgroup_split_huge_fixup(struct page *head)
> > +void split_page_memcg(struct page *head, unsigned int nr)
> >  {
> 
> Do we need input validation on nr? Can nr be aribtrary or can we enforce
> 
> VM_BUG_ON(!is_power_of_2(nr));

In practice this will be power of 2 but why should we bother to sanitze
that? 

-- 
Michal Hocko
SUSE Labs