From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Usama Arif <usama.arif@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
chrisl@kernel.org, kasong@tencent.com, ljs@kernel.org,
ziy@nvidia.com
Cc: bhe@redhat.com, willy@infradead.org, youngjun.park@lge.com,
hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev,
alex@ghiti.fr, kas@kernel.org, baohua@kernel.org,
dev.jain@arm.com, baolin.wang@linux.alibaba.com,
npache@redhat.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com,
Vlastimil Babka <vbabka@kernel.org>,
lance.yang@linux.dev, linux-kernel@vger.kernel.org,
nphamcs@gmail.com, shikemeng@huaweicloud.com,
kernel-team@meta.com
Subject: Re: [PATCH 03/13] fs/proc: use softleaf_has_pfn() in pagemap PMD walker
Date: Wed, 13 May 2026 15:35:36 +0200 [thread overview]
Message-ID: <7d859ff8-a2d6-4c3c-9326-2cda7689329a@kernel.org> (raw)
In-Reply-To: <20260427100553.2754667-4-usama.arif@linux.dev>
On 4/27/26 12:01, Usama Arif wrote:
> pagemap_pmd_range_thp() assumes that every non-present PMD is a
> migration entry and unconditionally calls softleaf_to_page(). This
> will crash on any non-present PMD type that does not encode a PFN,
> such as the upcoming PMD-level swap entries.
>
> Guard the page lookup with softleaf_has_pfn(), matching how
> pte_to_pagemap_entry() already handles non-present PTEs.
>
> Signed-off-by: Usama Arif <usama.arif@linux.dev>
> ---
Yes, just like pte_to_pagemap_entry() does
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-05-13 13:35 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 10:01 [PATCH 00/13] mm: PMD-level swap entries for anonymous THPs Usama Arif
2026-04-27 10:01 ` [PATCH 01/13] mm: add softleaf_to_pmd() and convert existing callers Usama Arif
2026-05-13 19:24 ` David Hildenbrand (Arm)
2026-05-29 7:20 ` Dev Jain
2026-05-29 14:47 ` Usama Arif
2026-04-27 10:01 ` [PATCH 02/13] mm: extract ensure_on_mmlist() helper Usama Arif
2026-05-13 13:32 ` David Hildenbrand (Arm)
2026-05-13 17:21 ` Usama Arif
2026-05-13 19:22 ` David Hildenbrand (Arm)
2026-05-29 7:42 ` Dev Jain
2026-04-27 10:01 ` [PATCH 03/13] fs/proc: use softleaf_has_pfn() in pagemap PMD walker Usama Arif
2026-05-13 13:35 ` David Hildenbrand (Arm) [this message]
2026-05-29 9:34 ` Dev Jain
2026-04-27 10:01 ` [PATCH 04/13] mm/huge_memory: move softleaf_to_folio() inside migration branch Usama Arif
2026-05-13 19:25 ` David Hildenbrand (Arm)
2026-05-29 11:31 ` Dev Jain
2026-04-27 10:01 ` [PATCH 05/13] mm: add PMD swap entry detection support Usama Arif
2026-05-30 8:06 ` Dev Jain
2026-04-27 10:01 ` [PATCH 06/13] mm: add PMD swap entry splitting support Usama Arif
2026-05-30 10:52 ` Dev Jain
2026-06-02 12:59 ` Usama Arif
2026-04-27 10:01 ` [PATCH 07/13] mm: handle PMD swap entries in fork path Usama Arif
2026-04-27 10:01 ` [PATCH 08/13] mm: swap in PMD swap entries as whole THPs during swapoff Usama Arif
2026-05-26 19:44 ` Alexandre Ghiti
2026-05-29 14:49 ` Usama Arif
2026-04-27 10:01 ` [PATCH 09/13] mm: handle PMD swap entries in non-present PMD walkers Usama Arif
2026-04-27 10:01 ` [PATCH 10/13] mm: handle PMD swap entries in UFFDIO_MOVE Usama Arif
2026-04-27 10:02 ` [PATCH 11/13] mm: handle PMD swap entry faults on swap-in Usama Arif
2026-04-27 10:02 ` [PATCH 12/13] mm: install PMD swap entries on swap-out Usama Arif
2026-04-27 10:02 ` [PATCH 13/13] selftests/mm: add PMD swap entry tests Usama Arif
2026-04-27 13:38 ` [PATCH 00/13] mm: PMD-level swap entries for anonymous THPs Usama Arif
2026-04-27 18:26 ` Zi Yan
2026-04-27 20:12 ` Usama Arif
2026-04-29 12:57 ` Zi Yan
2026-04-28 19:54 ` David Hildenbrand (Arm)
2026-04-29 9:39 ` Usama Arif
2026-04-29 12:52 ` Lorenzo Stoakes
2026-04-29 10:44 ` Kairui Song
2026-04-30 10:38 ` Usama Arif
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