linux-kernel - [PATCH v5 1/6] mm:/Kconfig changes for migrate on fault for device pages

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Message-ID: <20260211081301.2940672-2-mpenttil@redhat.com>
Date: Wed, 11 Feb 2026 10:12:56 +0200
From: mpenttil@...hat.com
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	Mika Penttilä <mpenttil@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	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>
Subject: [PATCH v5 1/6] mm:/Kconfig changes for migrate on fault for device pages

From: Mika Penttilä <mpenttil@...hat.com>

With the unified HMM/migrate_device page table walk
migrate_device needs HMM enabled and HMM needs
MMU notifiers. Enable them explicitly to avoid
breaking random configs.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...nel.org>
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>
Signed-off-by: Mika Penttilä <mpenttil@...hat.com>
---
 mm/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index a992f2203eb9..1b8778f34922 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -661,6 +661,7 @@ config MIGRATION
 
 config DEVICE_MIGRATION
 	def_bool MIGRATION && ZONE_DEVICE
+	select HMM_MIRROR
 
 config ARCH_ENABLE_HUGEPAGE_MIGRATION
 	bool
@@ -1236,6 +1237,7 @@ config ZONE_DEVICE
 config HMM_MIRROR
 	bool
 	depends on MMU
+	select MMU_NOTIFIER
 
 config GET_FREE_REGION
 	bool
-- 
2.50.0