linux-kernel - Re: [PATCH next] mm/migrate: fix remove_migration

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Message-ID: <Yh01WH6CdHjpUFkZ@casper.infradead.org>
Date:   Mon, 28 Feb 2022 20:49:28 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH next] mm/migrate: fix remove_migration_pte() of hugetlb
 entry

On Sat, Feb 26, 2022 at 06:25:15PM -0800, Hugh Dickins wrote:
> -		if (!folio_test_ksm(folio))
> +		/* Skip call in common case, plus .pgoff is invalid for KSM */
> +		if (pvmw.nr_pages != 1 && !folio_test_hugetlb(folio))
>  			idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff;

How do you feel about this instead?

-               if (!folio_test_ksm(folio))
+               /* pgoff is invalid for ksm pages, but they are never large */
+               if (folio_test_large(folio) && !folio_test_hugetlb(folio))
                        idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff;