[PATCH v3 4/4] arm64: mm: Override arch_wants_pte_order()

From: Ryan Roberts
Date: Fri Jul 14 2023 - 12:18:14 EST


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

Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>
---
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