[to-be-updated] mm-hugetlb_cma-fix-incorrect-hugetlb_cma_size-assignment-on-malformed-input.patch removed from -mm tree

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

The quilt patch titled
     Subject: mm/hugetlb_cma: fix incorrect hugetlb_cma_size assignment on malformed input
has been removed from the -mm tree.  Its filename was
     mm-hugetlb_cma-fix-incorrect-hugetlb_cma_size-assignment-on-malformed-input.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Kaitao Cheng <chengkaitao@kylinos.cn>
Subject: mm/hugetlb_cma: fix incorrect hugetlb_cma_size assignment on malformed input
Date: Mon, 02 Nov 2026 10:49:08 +0800

Patch series "mm/hugetlb: Fix CMA parsing, flags and usage accounting", v2.

This series fixes three independent HugeTLB issues reported by Sashiko,
covering CMA parameter parsing, persistent folio flags, and NR_HUGETLB
accounting on allocation rollback.

Patch 1 rejects a global hugetlb_cma size following node-specific entries.
This prevents malformed input from overwriting valid per-node reservations
with an incorrectly parsed global size.

Patch 2 preserves persistent folio flags when a failed vmemmap restore
returns a folio to the pool. This retains CMA allocation tracking and
raw hardware poison information, while ensuring transient flags are
cleared before returning the folio.

Patch 3 moves NR_HUGETLB node accounting to the underlying folio state
transitions and separates it from memcg statistics. This keeps the
counter balanced when surplus folios are freed during reservation
gathering or after a failed overcommit recheck.


This patch (of 3):

When hugetlb_cma contains a global size after node-specific entries,
cmdline_parse_hugetlb_cma() enters the global branch and reparses the
original parameter string. For hugetlb_cma=1:2G,4G, this interprets the
initial node ID as a one-byte global size and clears the 2 GiB reservation
recorded for node 1.

Global and node-specific formats cannot be mixed. Return -EINVAL when a
global entry follows a node-specific entry, before updating any settings.
This preserves the valid prefix, so the example retains node 1's 2 GiB
reservation and reports the malformed option.

Link: https://lore.kernel.org/20261102024910.31486-1-kaitao.cheng@linux.dev
Link: https://lore.kernel.org/20261102024910.31486-2-kaitao.cheng@linux.dev
Fixes: 38e719ab2673 ("hugetlb: support node specified when using cma for gigantic hugepages")
Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Closes: https://sashiko.dev/#/bug/linux-10f40d3e-3feb-4622-9da8-1fedecb2d0e2
Acked-by: Muchun Song <muchun.song@linux.dev>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: David Hildenbrand <david@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Mani Tofigh <mt4022@columbia.edu>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Frank van der Linden <fvdl@google.com>
Cc: Chris Down <chris@chrisdown.name>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Qi Zheng <qi.zheng@linux.dev>
---

 mm/hugetlb_cma.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/hugetlb_cma.c~mm-hugetlb_cma-fix-incorrect-hugetlb_cma_size-assignment-on-malformed-input
+++ a/mm/hugetlb_cma.c
@@ -165,6 +165,9 @@ static int __init cmdline_parse_hugetlb_
 		} else {
 			char *next;
 
+			if (s != p)
+				return -EINVAL;
+
 			tmp = memparse(p, &next);
 			if (*next == '%') {
 				if (tmp > 100) {
_

Patches currently in -mm which might be from chengkaitao@kylinos.cn are

mm-hugetlb-preserve-persistent-flags-when-returning-folios-to-the-pool.patch
mm-hugetlb-fix-nr_hugetlb-accounting-for-surplus-folios.patch