+ mm-hugetlb_cma-mark-hugetlb_cma_only-as-__ro_after_init.patch added to mm-new branch

+ mm-hugetlb_cma-mark-hugetlb_cma_only-as-__ro_after_init.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm: hugetlb_cma: mark hugetlb_cma{_only} as __ro_after_init
has been added to the -mm mm-new branch.  Its filename is
     mm-hugetlb_cma-mark-hugetlb_cma_only-as-__ro_after_init.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb_cma-mark-hugetlb_cma_only-as-__ro_after_init.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

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------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: mm: hugetlb_cma: mark hugetlb_cma{_only} as __ro_after_init
Date: Mon, 12 Jan 2026 23:09:54 +0800

hugetlb_cma and hugetlb_cma_only are initialized once during init and
never changed.

Link: https://lkml.kernel.org/r/20260112150954.1802953-6-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb_cma.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/hugetlb_cma.c~mm-hugetlb_cma-mark-hugetlb_cma_only-as-__ro_after_init
+++ a/mm/hugetlb_cma.c
@@ -13,9 +13,9 @@
 #include "hugetlb_cma.h"
 
 
-static struct cma *hugetlb_cma[MAX_NUMNODES];
+static struct cma *hugetlb_cma[MAX_NUMNODES] __ro_after_init;
 static unsigned long hugetlb_cma_size_in_node[MAX_NUMNODES] __initdata;
-static bool hugetlb_cma_only;
+static bool hugetlb_cma_only __ro_after_init;
 static unsigned long hugetlb_cma_size __ro_after_init;
 
 void hugetlb_cma_free_frozen_folio(struct folio *folio)
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page.patch
mm-page_alloc-add-__split_page.patch
mm-cma-kill-cma_pages_valid.patch
mm-page_alloc-add-alloc_contig_frozen_rangepages.patch
mm-cma-add-cma_alloc_frozen_compound.patch
mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation.patch
mm-page_isolation-introduce-page_is_unmovable.patch
mm-page_alloc-optimize-pfn_range_valid_contig.patch
mm-hugetlb-optimize-replace_free_hugepage_folios.patch
mm-hugetlb_cma-optimize-hugetlb_cma_alloc_frozen_folio.patch
mm-hugetlb_cma-mark-hugetlb_cma_only-as-__ro_after_init.patch