linux-kernel - [PATCH v3 01/12] mm/Kconfig: CONFIG_PGTABLE_HAS_HUGE

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Message-ID: <20240321220802.679544-2-peterx@redhat.com>
Date: Thu, 21 Mar 2024 18:07:51 -0400
From: peterx@...hat.com
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: linuxppc-dev@...ts.ozlabs.org,
	Michael Ellerman <mpe@...erman.id.au>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Matthew Wilcox <willy@...radead.org>,
	Rik van Riel <riel@...riel.com>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	peterx@...hat.com,
	Yang Shi <shy828301@...il.com>,
	John Hubbard <jhubbard@...dia.com>,
	linux-arm-kernel@...ts.infradead.org,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Andrew Jones <andrew.jones@...ux.dev>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Christoph Hellwig <hch@...radead.org>,
	linux-riscv@...ts.infradead.org,
	James Houghton <jthoughton@...gle.com>,
	David Hildenbrand <david@...hat.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH v3 01/12] 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