linux-kernel - Re: [PATCH v2 5/5] mm/khugepaged: Convert collapse_pte_mapped

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Message-ID: <ZTBjv4jyQ5/zu5cw@fedora>
Date:   Wed, 18 Oct 2023 16:01:19 -0700
From:   Vishal Moola <vishal.moola@...il.com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        shy828301@...il.com
Subject: Re: [PATCH v2 5/5] mm/khugepaged: Convert collapse_pte_mapped_thp()
 to use folios

On Wed, Oct 18, 2023 at 01:32:13PM -0700, Vishal Moola (Oracle) wrote:
> This removes 2 calls to compound_head() and helps convert khugepaged to
> use folios throughout.
> 
> Previously, if the address passed to collapse_pte_mapped_thp()
> corresponded to a tail page, the scan would fail immediately. Using
> filemap_lock_folio() we can get the corresponding folio back and try to
> operate on the folio instead.
> 
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>

Hi Andrew, I've attached a fix patch addressing the syzbot issue.
It can be squashed into this patch, syzbot tested it on v2 already as
well.

View attachment "0001-syz-fix.patch" of type "text/plain" (1157 bytes)