Re: [PATCH mm-hotfixes] mm/hugetlb: avoid false positive lockdep assertion

[Lorenzo Stoakes <ljs@kernel.org>]

Hi Andrew,

Could you apply the below fix-patch to this?

I had forgotten to account for the !CONFIG_HUGETLB_PMD_PAGE_TABLE_SHARING case.

Thanks, Lorenzo

----8<----
From e7f25943f72bfa224508ffe2bff526d3daab23fb Mon Sep 17 00:00:00 2001
From: Lorenzo Stoakes <ljs@kernel.org>
Date: Thu, 14 May 2026 10:45:38 +0100
Subject: [PATCH] fixup

Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
 mm/hugetlb.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index cfb7cb2e9806..4b3849d9a3f3 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -118,6 +118,9 @@ static int hugetlb_acct_memory(struct hstate *h, long delta);
 static void hugetlb_vma_lock_free(struct vm_area_struct *vma);
 static void hugetlb_vma_lock_alloc(struct vm_area_struct *vma);
 static void __hugetlb_vma_unlock_write_free(struct vm_area_struct *vma);
+static int __huge_pmd_unshare(struct mmu_gather *tlb,
+		struct vm_area_struct *vma, unsigned long addr, pte_t *ptep,
+		bool check_locks);
 static void hugetlb_unshare_pmds(struct vm_area_struct *vma,
 		unsigned long start, unsigned long end, bool take_locks);
 static struct resv_map *vma_resv_map(struct vm_area_struct *vma);
@@ -6971,6 +6974,13 @@ pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
 	return NULL;
 }

+static int __huge_pmd_unshare(struct mmu_gather *tlb,
+		struct vm_area_struct *vma, unsigned long addr, pte_t *ptep,
+		bool check_locks)
+{
+	return 0;
+}
+
 int huge_pmd_unshare(struct mmu_gather *tlb, struct vm_area_struct *vma,
 		unsigned long addr, pte_t *ptep)
 {
--
2.54.0