linux-kernel - [RFC PATCH 2/5] mm/huge_memory: use page_rmappable

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Message-ID: <20260130034818.472804-3-ziy@nvidia.com>
Date: Thu, 29 Jan 2026 22:48:15 -0500
From: Zi Yan <ziy@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>,
	David Hildenbrand <david@...nel.org>,
	Matthew Wilcox <willy@...radead.org>
Cc: Alistair Popple <apopple@...dia.com>,
	Balbir Singh <balbirs@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.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>,
	Jens Axboe <axboe@...nel.dk>,
	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>,
	Barry Song <baohua@...nel.org>,
	Lance Yang <lance.yang@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Oscar Salvador <osalvador@...e.de>,
	Brendan Jackman <jackmanb@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	io-uring@...r.kernel.org
Subject: [RFC PATCH 2/5] mm/huge_memory: use page_rmappable_folio() to convert after-split folios

Current code uses folio_set_large_rmappable() on after-split folios, but
these folios should be treated as compound pages and converted to folios
with page_rmappable_folio().

This prepares for code separation of compound page and folio in a follow-up
commit.

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 mm/huge_memory.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 44ff8a648afd..74ba076e3fc0 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3558,10 +3558,9 @@ static void __split_folio_to_order(struct folio *folio, int old_order,
 		 * which needs correct compound_head().
 		 */
 		clear_compound_head(new_head);
-		if (new_order) {
+		if (new_order)
 			prep_compound_page(new_head, new_order);
-			folio_set_large_rmappable(new_folio);
-		}
+		page_rmappable_folio(new_head);
 
 		if (folio_test_young(folio))
 			folio_set_young(new_folio);
-- 
2.51.0