linux-kernel - [PATCH v1 0/2] mm/huge_memory: don't mark refcounted pages special in vmf_insert_folio

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Message-ID: <20250603211634.2925015-1-david@redhat.com>
Date: Tue,  3 Jun 2025 23:16:32 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	nvdimm@...ts.linux.dev,
	linux-cxl@...r.kernel.org,
	David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alistair Popple <apopple@...dia.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Zi Yan <ziy@...dia.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Nico Pache <npache@...hat.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Dev Jain <dev.jain@....com>,
	Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH v1 0/2] mm/huge_memory: don't mark refcounted pages special in vmf_insert_folio_*()

Based on Linus' master.

While working on improving vm_normal_page() and friends, I stumbled
over this issues: refcounted "normal" pages must not be marked
using pmd_special() / pud_special().

Fortunately, so far there doesn't seem to be serious damage.

This is only compile-tested so far. Still looking for an easy way to test
PMD/PUD mappings with DAX. Any tests I can easily run?

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alistair Popple <apopple@...dia.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Zi Yan <ziy@...dia.com>
Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: Nico Pache <npache@...hat.com>
Cc: Ryan Roberts <ryan.roberts@....com>
Cc: Dev Jain <dev.jain@....com>
Cc: Dan Williams <dan.j.williams@...el.com>

David Hildenbrand (2):
  mm/huge_memory: don't mark refcounted pages special in
    vmf_insert_folio_pmd()
  mm/huge_memory: don't mark refcounted pages special in
    vmf_insert_folio_pud()

 include/linux/mm.h | 15 ++++++++++
 mm/huge_memory.c   | 72 +++++++++++++++++++++++++++++++++++-----------
 2 files changed, 70 insertions(+), 17 deletions(-)

base-commit: a9dfb7db96f7bc1f30feae673aab7fdbfbc94e9c
-- 
2.49.0