[PATCH v4 3/5] arm64: mm: Override arch_wants_pte_order()

[Ryan Roberts <ryan.roberts@arm.com>]

Define an arch-specific override of arch_wants_pte_order() so that when
LARGE_ANON_FOLIO is enabled, large folios will be allocated for
anonymous memory with an order that is compatible with arm64's contpte
mappings.

Reviewed-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
 arch/arm64/include/asm/pgtable.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 0bd18de9fd97..d00bb26fe28f 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1106,6 +1106,12 @@ extern pte_t ptep_modify_prot_start(struct vm_area_struct *vma,
 extern void ptep_modify_prot_commit(struct vm_area_struct *vma,
 				    unsigned long addr, pte_t *ptep,
 				    pte_t old_pte, pte_t new_pte);
+
+#define arch_wants_pte_order arch_wants_pte_order
+static inline int arch_wants_pte_order(void)
+{
+	return CONT_PTE_SHIFT - PAGE_SHIFT;
+}
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_PGTABLE_H */
-- 
2.25.1