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SubjectRe: [PATCH -next v2] mm/hotplug: silence a lockdep splat with printk()
On Wed 15-01-20 07:35:45, Qian Cai wrote:
>
>
> > On Jan 15, 2020, at 4:22 AM, Michal Hocko <mhocko@kernel.org> wrote:
> >
> > Is this correct? CMA pages cannot be comound?
>
> I never saw a CMA page also a compound page. Also, in
> alloc_contig_range(), it calls migrate_pages()—>
> unmap_and_move_huge_page() which will free the old huge page, so I
> think that will clear pageCompound.

This sounds like the implementation detail. I do not think you want to
depend on that. Anyway, see my other response. If you rebase on top of
Vlastimil's patch you do not really have to care.
--
Michal Hocko
SUSE Labs

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