+ mm-maps-read-proc-pid-maps-under-per-vma-lock-fix.patch added to mm-new branch

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

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The patch titled
     Subject: mm/madvise: fixup stray mmap lock assert in anon_vma_name()
has been added to the -mm mm-new branch.  Its filename is
     mm-maps-read-proc-pid-maps-under-per-vma-lock-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-maps-read-proc-pid-maps-under-per-vma-lock-fix.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.

Before you just go and hit "reply", please:
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Subject: mm/madvise: fixup stray mmap lock assert in anon_vma_name()
Date: Wed, 25 Jun 2025 13:28:36 +0100

anon_vma_name() is being called under VMA lock, but is assert mmap lock which
won't necessarily be held.

This results in the kernel spamming warnings about this on startup.

Replace this with an open-coded 'mmap or VMA lock' assert to resolve.

Link: https://lkml.kernel.org/r/fd305c41-b2a3-4f0c-a64d-6e2358859529@lucifer.local
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: Suren Baghdasaryan <surenb@google.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Cc: T.J. Mercier <tjmercier@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Ye Bin <yebin10@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/madvise.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/madvise.c~mm-maps-read-proc-pid-maps-under-per-vma-lock-fix
+++ a/mm/madvise.c
@@ -108,7 +108,8 @@ void anon_vma_name_free(struct kref *kre
 
 struct anon_vma_name *anon_vma_name(struct vm_area_struct *vma)
 {
-	mmap_assert_locked(vma->vm_mm);
+	if (!rwsem_is_locked(&vma->vm_mm->mmap_lock))
+		vma_assert_locked(vma);
 
 	return vma->anon_name;
 }
_

Patches currently in -mm which might be from lorenzo.stoakes@oracle.com are

maintainers-add-missing-files-to-mm-page-alloc-section.patch
docs-mm-expand-vma-doc-to-highlight-pte-freeing-non-vma-traversal.patch
mm-ksm-have-ksm-vma-checks-not-require-a-vma-pointer.patch
mm-ksm-refer-to-special-vmas-via-vm_special-in-ksm_compatible.patch
mm-prevent-ksm-from-breaking-vma-merging-for-new-vmas.patch
mm-prevent-ksm-from-breaking-vma-merging-for-new-vmas-fix.patch
tools-testing-selftests-add-vma-merge-tests-for-ksm-merge.patch
mm-use-per_vma-lock-for-madv_dontneed-fix.patch
mm-pagewalk-split-walk_page_range_novma-into-kernel-user-parts.patch
secretmem-remove-uses-of-struct-page-fix.patch
mm-vma-use-vmg-target-to-specify-target-vma-for-new-vma-merge.patch
mm-vma-use-vmg-target-to-specify-target-vma-for-new-vma-merge-fix.patch
mm-change-vm_get_page_prot-to-accept-vm_flags_t-argument.patch
mm-change-vm_get_page_prot-to-accept-vm_flags_t-argument-fix.patch
mm-update-core-kernel-code-to-use-vm_flags_t-consistently.patch
mm-update-architecture-and-driver-code-to-use-vm_flags_t.patch
mm-madvise-remove-the-visitor-pattern-and-thread-anon_vma-state.patch
mm-madvise-thread-mm_struct-through-madvise_behavior.patch
mm-madvise-thread-vma-range-state-through-madvise_behavior.patch
mm-madvise-thread-all-madvise-state-through-madv_behavior.patch
mm-madvise-eliminate-very-confusing-manipulation-of-prev-vma.patch
mm-madvise-eliminate-very-confusing-manipulation-of-prev-vma-fix.patch
mm-maps-read-proc-pid-maps-under-per-vma-lock-fix.patch