linux-kernel - [PATCH v4 01/13] mm/Kconfig: CONFIG_PGTABLE_HAS_HUGE

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Date: Wed, 27 Mar 2024 11:23:20 -0400
From: peterx@...hat.com
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Yang Shi <shy828301@...il.com>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	John Hubbard <jhubbard@...dia.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	peterx@...hat.com,
	Andrew Jones <andrew.jones@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	linux-riscv@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Matthew Wilcox <willy@...radead.org>,
	Rik van Riel <riel@...riel.com>,
	linux-arm-kernel@...ts.infradead.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	David Hildenbrand <david@...hat.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	James Houghton <jthoughton@...gle.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Mike Rapoport <rppt@...nel.org>,
	Axel Rasmussen <axelrasmussen@...gle.com>
Subject: [PATCH v4 01/13] mm/Kconfig: CONFIG_PGTABLE_HAS_HUGE_LEAVES

From: Peter Xu <peterx@...hat.com>

Introduce a config option that will be selected as long as huge leaves are
involved in pgtable (thp or hugetlbfs).  It would be useful to mark any
code with this new config that can process either hugetlb or thp pages in
any level that is higher than pte level.

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 mm/Kconfig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index b924f4a5a3ef..497cdf4d8ebf 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -850,6 +850,12 @@ config READ_ONLY_THP_FOR_FS
 
 endif # TRANSPARENT_HUGEPAGE
 
+#
+# The architecture supports pgtable leaves that is larger than PAGE_SIZE
+#
+config PGTABLE_HAS_HUGE_LEAVES
+	def_bool TRANSPARENT_HUGEPAGE || HUGETLB_PAGE
+
 #
 # UP and nommu archs use km based percpu allocator
 #
-- 
2.44.0