[RFC PATCH 1/8] arm64/hugetlb: Extend batching of multiple CONT_PTE in a single PTE setup

["Barry Song (Xiaomi)" <baohua@kernel.org>]

For sizes aligned to CONT_PTE_SIZE and smaller than PMD_SIZE,
we can batch CONT_PTE settings instead of handling them individually.

Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
---
 arch/arm64/mm/hugetlbpage.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index a42c05cf5640..bf31c11ebd3b 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -110,6 +110,12 @@ static inline int num_contig_ptes(unsigned long size, size_t *pgsize)
 		contig_ptes = CONT_PTES;
 		break;
 	default:
+		if (size < CONT_PMD_SIZE && size > 0 &&
+				IS_ALIGNED(size, CONT_PTE_SIZE)) {
+			contig_ptes = size >> PAGE_SHIFT;
+			*pgsize = PAGE_SIZE;
+			break;
+		}
 		WARN_ON(!__hugetlb_valid_size(size));
 	}
 
@@ -359,6 +365,10 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
 	case CONT_PTE_SIZE:
 		return pte_mkcont(entry);
 	default:
+		if (pagesize < CONT_PMD_SIZE && pagesize > 0 &&
+				IS_ALIGNED(pagesize, CONT_PTE_SIZE))
+			return pte_mkcont(entry);
+
 		break;
 	}
 	pr_warn("%s: unrecognized huge page size 0x%lx\n",
-- 
2.39.3 (Apple Git-146)