[PATCH v1 7/8] arm64: hugetlb: Convert set_huge_pte_at() to take vma

Ryan Roberts ryan.roberts at arm.com
Fri Sep 22 02:20:06 AEST 2023

In order to fix a bug, arm64 needs access to the vma inside it's
implementation of set_huge_pte_at(). Provide for this by converting the
mm parameter to be a vma. Any implementations that require the mm can
access it via vma->vm_mm.

This commit makes the required arm64 modifications. Separate commits
update the other arches and core code, before the actual bug is fixed in

No behavioral changes intended.

Signed-off-by: Ryan Roberts <ryan.roberts at arm.com>
 arch/arm64/include/asm/hugetlb.h | 2 +-
 arch/arm64/mm/hugetlbpage.c      | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index f43a38ac1779..efc9025b9d27 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -27,7 +27,7 @@ static inline void arch_clear_hugepage_flags(struct page *page)
 pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
 #define arch_make_huge_pte arch_make_huge_pte
-extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+extern void set_huge_pte_at(struct vm_area_struct *vma, unsigned long addr,
 			    pte_t *ptep, pte_t pte);
 extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 9c52718ea750..844832511c1e 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -248,9 +248,10 @@ static inline struct folio *hugetlb_swap_entry_to_folio(swp_entry_t entry)
 	return page_folio(pfn_to_page(swp_offset_pfn(entry)));
-void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+void set_huge_pte_at(struct vm_area_struct *vma, unsigned long addr,
 			    pte_t *ptep, pte_t pte)
+	struct mm_struct *mm = vma->vm_mm;
 	size_t pgsize;
 	int i;
 	int ncontig;
@@ -571,5 +572,5 @@ pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr
 void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep,
 				  pte_t old_pte, pte_t pte)
-	set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
+	set_huge_pte_at(vma, addr, ptep, pte);

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