[PATCH 09/17] arm64/mm: Override read-write accessors for vm_page_prot

[Anshuman Khandual]

Override pgprot_[read|write]() accessors using ptval_[get|set]() providing
required single copy atomic operation for vma->vm_page_prot.

Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
 arch/arm64/include/asm/pgtable.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 4efcacec6f01..39635f9550c2 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -122,6 +122,18 @@ static inline pgd_t pgdp_get(pgd_t *pgdp)
 	return ptval_get(*pgdp);
 }
 
+#define pgprot_read pgprot_read
+static inline pgprot_t pgprot_read(pgprot_t *prot)
+{
+	return ptval_get(*prot);
+}
+
+#define pgprot_write pgprot_write
+static inline void pgprot_write(pgprot_t *prot, pgprot_t val)
+{
+	ptval_set(*prot, val);
+}
+
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 #define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
 
-- 
2.43.0