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Date:   Wed, 26 Jan 2022 18:30:10 +0100
From:   Ard Biesheuvel <>
        Ard Biesheuvel <>,
        Will Deacon <>, Marc Zyngier <>,
        Fuad Tabba <>,
        Quentin Perret <>,
        Mark Rutland <>,
        James Morse <>,
        Catalin Marinas <>
Subject: [RFC PATCH 11/12] arm64: efi: use set_pte_at() not set_pte() in order to pass mm pointer

The set_pte() helper does not carry the struct mm pointer, which makes
it difficult for the implementation to reason about the context in which
the set_pte() call is taking place. So switch to set_pte_at() instead.

Signed-off-by: Ard Biesheuvel <>
 arch/arm64/kernel/efi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index e1be6c429810..e3e50adfae18 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -92,7 +92,7 @@ static int __init set_permissions(pte_t *ptep, unsigned long addr, void *data)
 		pte = set_pte_bit(pte, __pgprot(PTE_RDONLY));
 	if (md->attribute & EFI_MEMORY_XP)
 		pte = set_pte_bit(pte, __pgprot(PTE_PXN));
-	set_pte(ptep, pte);
+	set_pte_at(&efi_mm, addr, ptep, pte);
 	return 0;

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