linux-kernel - Re: [PATCH] mm/memfd: clear hugetlb pages on allocation

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Message-ID: <CADhLXY4qMvBTqirNmzgiPszn8vCkCFV6GGeDkNpxVDi32uhzEw@mail.gmail.com>
Date: Wed, 12 Nov 2025 12:58:57 +0530
From: Deepanshu Kartikey <kartikey406@...il.com>
To: Hugh Dickins <hughd@...gle.com>
Cc: Muchun Song <muchun.song@...ux.dev>, Oscar Salvador <osalvador@...e.de>, 
	David Hildenbrand <david@...hat.com>, Vivek Kasireddy <vivek.kasireddy@...el.com>, 
	baolin.wang@...ux.alibaba.com, akpm@...ux-foundation.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, 
	syzbot+f64019ba229e3a5c411b@...kaller.appspotmail.com
Subject: Re: [PATCH] mm/memfd: clear hugetlb pages on allocation

Hi Hugh,

Thank you for the quick review and for looping in the hugetlb maintainers!

You raise good points about the approach. I chose explicit zeroing in
memfd_alloc_folio() because hugetlb_reserve_pages() can allocate pages
without seeing the __GFP_ZERO flag, but I'm happy to revise if the
hugetlb maintainers prefer a different approach.

I'll add the Fixes: 89c1905d9c14 tag and Cc: stable in v2.

Should I send v2 now with just the tag added, or wait for feedback from
Muchun/Oscar/David on the overall approach first?

Thanks,
Deepanshu