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

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Message-ID: <20231219075538.414708-2-peterx@redhat.com>
Date: Tue, 19 Dec 2023 15:55:26 +0800
From: peterx@...hat.com
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: Matthew Wilcox <willy@...radead.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Mike Rapoport <rppt@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	John Hubbard <jhubbard@...dia.com>,
	Andrew Jones <andrew.jones@...ux.dev>,
	linux-arm-kernel@...ts.infradead.org,
	Michael Ellerman <mpe@...erman.id.au>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	linuxppc-dev@...ts.ozlabs.org,
	Rik van Riel <riel@...riel.com>,
	linux-riscv@...ts.infradead.org,
	Yang Shi <shy828301@...il.com>,
	James Houghton <jthoughton@...gle.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	peterx@...hat.com,
	Axel Rasmussen <axelrasmussen@...gle.com>
Subject: [PATCH 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.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 mm/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index 8f8b02e9c136..4ca97d959323 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -904,6 +904,9 @@ config READ_ONLY_THP_FOR_FS
 
 endif # TRANSPARENT_HUGEPAGE
 
+config PGTABLE_HAS_HUGE_LEAVES
+	def_bool TRANSPARENT_HUGEPAGE || HUGETLB_PAGE
+
 #
 # UP and nommu archs use km based percpu allocator
 #
-- 
2.41.0