[merged mm-stable] mm-assert-mmap-lock-held-use-new-flags-api-in-vm_insert_page.patch removed from -mm tree

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

The quilt patch titled
     Subject: mm: assert mmap lock held, use new flags API in vm_insert_page[s]
has been removed from the -mm tree.  Its filename was
     mm-assert-mmap-lock-held-use-new-flags-api-in-vm_insert_page.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Subject: mm: assert mmap lock held, use new flags API in vm_insert_page[s]
Date: Tue, 13 Oct 2026 16:04:47 +0100

The existing logic asserts that an mmap write lock is held, bizarrely, by
asserting that an mmap_read_trylock() fails (which is not the same thing).

Assert the mmap write lock here and switch to using the new VMA flags API
while here.

Note that the vma_start_write() is explicitly broken out from
vm_flags_set() here in order to use vma_set_flags() safely.

Link: https://lore.kernel.org/20261013-b4-mmap-prepare-vma-flag-sanify-v6-7-1aa3c9b139f9@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Gregory Price (Meta) <gourry@gourry.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <stephen.smalley.work@gmail.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
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Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Dev Jain <dev.jain@arm.com>
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Cc: Lance Yang <lance.yang@linux.dev>
Cc: Usama Arif <usama.arif@linux.dev>
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Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Ying Huang <ying.huang@linux.alibaba.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Chris Li <chrisl@kernel.org>
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Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Xu Xin <xu.xin@linux.dev>
Cc: Ihor Solodrai <ihor.solodrai@linux.dev>
Cc: Bert Karwatzki <spasswolf@web.de>
---

 mm/memory.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

--- a/mm/memory.c~mm-assert-mmap-lock-held-use-new-flags-api-in-vm_insert_page
+++ a/mm/memory.c
@@ -2599,10 +2599,11 @@ int vm_insert_pages(struct vm_area_struc
 
 	if (!range_in_vma(vma, addr, end))
 		return -EFAULT;
-	if (!(vma->vm_flags & VM_MIXEDMAP)) {
-		VM_WARN_ON_ONCE(mmap_read_trylock(vma->vm_mm));
-		VM_WARN_ON_ONCE(vma->vm_flags & VM_PFNMAP);
-		vm_flags_set(vma, VM_MIXEDMAP);
+	if (!vma_test(vma, VMA_MIXEDMAP_BIT)) {
+		mmap_assert_write_locked(vma->vm_mm);
+		VM_WARN_ON_ONCE(vma_test(vma, VMA_PFNMAP_BIT));
+		vma_start_write(vma);
+		vma_set_flags(vma, VMA_MIXEDMAP_BIT);
 	}
 	/* Defer page refcount checking till we're about to map that page. */
 	return insert_pages(vma, addr, pages, num, vma->vm_page_prot);
@@ -2675,10 +2676,11 @@ int vm_insert_page(struct vm_area_struct
 {
 	if (addr < vma->vm_start || addr >= vma->vm_end)
 		return -EFAULT;
-	if (!(vma->vm_flags & VM_MIXEDMAP)) {
-		BUG_ON(mmap_read_trylock(vma->vm_mm));
-		BUG_ON(vma->vm_flags & VM_PFNMAP);
-		vm_flags_set(vma, VM_MIXEDMAP);
+	if (!vma_test(vma, VMA_MIXEDMAP_BIT)) {
+		mmap_assert_write_locked(vma->vm_mm);
+		VM_WARN_ON_ONCE(vma_test(vma, VMA_PFNMAP_BIT));
+		vma_start_write(vma);
+		vma_set_flags(vma, VMA_MIXEDMAP_BIT);
 	}
 	return insert_page(vma, addr, page, vma->vm_page_prot, false);
 }
_

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

mm-vma-fix-expansion-of-vma_mixedmap_bit-vmas.patch
mm-do-not-unintentionally-overwrite-atomic-vma-flags.patch
mm-vma-avoid-losing-atomic-vma-flags-when-setting-sticky-vma-flags.patch