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Date:   Thu, 14 Feb 2019 13:17:57 -0800
From:   Matthew Wilcox <willy@infradead.org>
To:     "Kirill A. Shutemov" <kirill@shutemov.name>
Cc:     linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, Hugh Dickins <hughd@google.com>,
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Subject: Re: [PATCH v2] page cache: Store only head pages in i_pages
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On Thu, Feb 14, 2019 at 04:30:04PM +0300, Kirill A. Shutemov wrote:
>  - migrate_page_move_mapping() has to be converted too.

I think that's as simple as:

+++ b/mm/migrate.c
@@ -465,7 +465,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
 
                for (i = 1; i < HPAGE_PMD_NR; i++) {
                        xas_next(&xas);
-                       xas_store(&xas, newpage + i);
+                       xas_store(&xas, newpage);
                }
        }
 

or do you see something else I missed?