linux-kernel - Re: [PATCH -next v2] mm/hotplug: silence a lockdep splat with printk()

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Message-Id: <39D75B58-A5CE-4837-BCD3-8026E2C88861@lca.pw>
Date:   Wed, 15 Jan 2020 07:35:45 -0500
From:   Qian Cai <cai@....pw>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     akpm@...ux-foundation.org, sergey.senozhatsky.work@...il.com,
        pmladek@...e.com, rostedt@...dmis.org, peterz@...radead.org,
        david@...hat.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH -next v2] mm/hotplug: silence a lockdep splat with printk()



> On Jan 15, 2020, at 4:22 AM, Michal Hocko <mhocko@...nel.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.

Cc Mike in case I miss anything.