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Date:   Fri, 26 Feb 2021 12:13:14 +0000
From:   Matthew Wilcox <>
To:     Yu Zhao <>
Subject: Re: [PATCH v2 3/3] mm: use PF_ONLY_HEAD for PG_active and

On Fri, Feb 26, 2021 at 02:17:18AM -0700, Yu Zhao wrote:
> All places but one test, set or clear PG_active and PG_unevictable on
> small or head pages. Use compound_head() explicitly for that singleton
> so the rest can rid of redundant compound_head().

How do you know it's only one place?  I really wish you'd work with me
on folios.  They make the compiler prove that it's not a tail page.

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