linux-kernel - [PATCH 33/45] mm/hmm: Enable hmm_vma_walk_pud to handle PUD-mapped hugetlb vmas

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Message-ID: <20240704043132.28501-34-osalvador@suse.de>
Date: Thu,  4 Jul 2024 06:31:20 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Peter Xu <peterx@...hat.com>,
	Muchun Song <muchun.song@...ux.dev>,
	David Hildenbrand <david@...hat.com>,
	SeongJae Park <sj@...nel.org>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Michal Hocko <mhocko@...e.com>,
	Matthew Wilcox <willy@...radead.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Oscar Salvador <osalvador@...e.de>
Subject: [PATCH 33/45] mm/hmm: Enable hmm_vma_walk_pud to handle PUD-mapped hugetlb vmas

Normal THP cannot be PUD-mapped (besides devmap), but hugetlb can,
so enable hmm_vma_walk_pud to handle PUD-mapped hugetlb vmas.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
 mm/hmm.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index fbee08973544..2b752f703b6d 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -396,8 +396,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
 	return 0;
 }
 
-#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && \
-    defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
+#if (defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || defined (CONFIG_PGTABLE_HAS_HUGE_LEAVES))
 static inline unsigned long pud_to_hmm_pfn_flags(struct hmm_range *range,
 						 pud_t pud)
 {
@@ -429,7 +428,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
 		return hmm_vma_walk_hole(start, end, -1, walk);
 	}
 
-	if (pud_leaf(pud) && pud_devmap(pud)) {
+	if (pud_leaf(pud)) {
 		unsigned long i, npages, pfn;
 		unsigned int required_fault;
 		unsigned long *hmm_pfns;
-- 
2.26.2