linux-kernel - [PATCH v3 3/7] mm: Split device-private and coherent folios before freeing

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Message-ID: <20260109085605.443316-4-francois.dugast@intel.com>
Date: Fri,  9 Jan 2026 09:54:23 +0100
From: Francois Dugast <francois.dugast@...el.com>
To: intel-xe@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org,
	Matthew Brost <matthew.brost@...el.com>,
	Balbir Singh <balbirs@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Zi Yan <ziy@...dia.com>,
	David Hildenbrand <david@...nel.org>,
	Oscar Salvador <osalvador@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Francois Dugast <francois.dugast@...el.com>
Subject: [PATCH v3 3/7] mm: Split device-private and coherent folios before freeing

From: Matthew Brost <matthew.brost@...el.com>

Split device-private and coherent folios into individual pages before
freeing so that any order folio can be formed upon the next use of the
pages.

Cc: Balbir Singh <balbirs@...dia.com>
Cc: Alistair Popple <apopple@...dia.com>
Cc: Zi Yan <ziy@...dia.com>
Cc: David Hildenbrand <david@...nel.org>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-cxl@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Matthew Brost <matthew.brost@...el.com>
Signed-off-by: Francois Dugast <francois.dugast@...el.com>
---
 mm/memremap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/memremap.c b/mm/memremap.c
index 63c6ab4fdf08..7289cdd6862f 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -453,6 +453,8 @@ void free_zone_device_folio(struct folio *folio)
 	case MEMORY_DEVICE_COHERENT:
 		if (WARN_ON_ONCE(!pgmap->ops || !pgmap->ops->folio_free))
 			break;
+
+		folio_split_unref(folio);
 		pgmap->ops->folio_free(folio);
 		percpu_ref_put_many(&folio->pgmap->ref, nr);
 		break;
-- 
2.43.0