[to-be-updated] arm64-hugetlb-extend-batching-of-multiple-cont_pte-in-a-single-pte-setup.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: arm64/hugetlb: extend batching of multiple CONT_PTE in a single PTE setup
has been removed from the -mm tree.  Its filename was
     arm64-hugetlb-extend-batching-of-multiple-cont_pte-in-a-single-pte-setup.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: "Barry Song (Xiaomi)" <baohua@kernel.org>
Subject: arm64/hugetlb: extend batching of multiple CONT_PTE in a single PTE setup
Date: Thu, 18 Jun 2026 16:47:21 +0800

Patch series "mm/vmalloc: Speed up ioremap, vmalloc and vmap with
contiguous memory", v4.

This patchset accelerates ioremap, vmalloc, and vmap when the memory is
physically fully or partially contiguous.  Two techniques are used:

1. Avoid page table rewalk when setting PTEs/PMDs for multiple memory
   segments
2. Use batched mappings wherever possible in both vmalloc and ARM64
   layers

Besides accelerating the mapping path, this also enables large mappings
(PMD and cont-PTE) for vmap, which are currently not supported.

Patches 1-2 extend ARM64 vmalloc CONT-PTE mapping to support multiple
CONT-PTE regions instead of just one.

Patch 3 extracts a common helper vmap_set_ptes() that consolidates PTE
mapping logic between the ioremap and vmalloc/vmap paths, handling both
CONT_PTE and regular PTE mappings.  This prepares for the next patch.

Patch 4 extends the page table walk path to support page shifts other than
PAGE_SHIFT and eliminates the page table rewalk for huge vmalloc mappings.
The function is renamed from vmap_small_pages_range_noflush() to
vmap_pages_range_noflush_walk().

Patches 5-6 add huge vmap support for contiguous pages, including support
for non-compound pages with pfn alignment verification.

On the RK3588 8-core ARM64 SoC, with tasks pinned to a little core and the
performance CPUfreq policy enabled, benchmark results:

* ioremap(1 MB): 1.35x faster (3407 ns -> 2526 ns)
* vmalloc(1 MB) mapping time (excluding allocation) with
  VM_ALLOW_HUGE_VMAP: 1.42x faster (5.00 us -> 3.53us)
* vmap(100MB) with order-8 pages: 8.3x faster (1235 us -> 149 us)

Many thanks to Xueyuan Chen for his testing efforts on RK3588 boards.


This patch (of 6):

For sizes aligned to CONT_PTE_SIZE and smaller than PMD_SIZE, we can
handle CONT_PTE_SIZE groups together.

Link: https://lore.kernel.org/20260618084726.1070022-1-jiangwen6@xiaomi.com
Link: https://lore.kernel.org/20260618084726.1070022-2-jiangwen6@xiaomi.com
Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
Signed-off-by: Wen Jiang <jiangwen6@xiaomi.com>
Tested-by: Xueyuan Chen <xueyuan.chen21@gmail.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Cc: Andrew Donnellan <ajd@linux.ibm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Wen Jiang <jiangwenxiaomi@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/mm/hugetlbpage.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/arch/arm64/mm/hugetlbpage.c~arm64-hugetlb-extend-batching-of-multiple-cont_pte-in-a-single-pte-setup
+++ a/arch/arm64/mm/hugetlbpage.c
@@ -110,6 +110,12 @@ static inline int num_contig_ptes(unsign
 		contig_ptes = CONT_PTES;
 		break;
 	default:
+		if (size > 0 && size < PMD_SIZE &&
+				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, un
 	case CONT_PTE_SIZE:
 		return pte_mkcont(entry);
 	default:
+		if (pagesize > 0 && pagesize < PMD_SIZE &&
+				IS_ALIGNED(pagesize, CONT_PTE_SIZE))
+			return pte_mkcont(entry);
+
 		break;
 	}
 	pr_warn("%s: unrecognized huge page size 0x%lx\n",
_

Patches currently in -mm which might be from baohua@kernel.org are

arm64-vmalloc-allow-arch_vmap_pte_range_map_size-to-batch-multiple-cont_pte.patch
mm-vmalloc-extend-page-table-walk-to-support-larger-page_shift-sizes-and-eliminate-page-table-rewalk.patch
mm-vmalloc-map-contiguous-pages-in-batches-for-vmap-if-possible.patch
mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch