[merged mm-stable] mm-mmap-write-lock-vmas-in-vma_prepare-before-modifying-them.patch removed from -mm tree

[merged mm-stable] mm-mmap-write-lock-vmas-in-vma_prepare-before-modifying-them.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/mmap: write-lock VMAs in vma_prepare before modifying them
has been removed from the -mm tree.  Its filename was
     mm-mmap-write-lock-vmas-in-vma_prepare-before-modifying-them.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: Suren Baghdasaryan <surenb@google.com>
Subject: mm/mmap: write-lock VMAs in vma_prepare before modifying them
Date: Mon, 27 Feb 2023 09:36:15 -0800

Write-lock all VMAs which might be affected by a merge, split, expand or
shrink operations.  All these operations use vma_prepare() before making
the modifications, therefore it provides a centralized place to perform
VMA locking.

[surenb@google.com: remove unnecessary vp->vma check in vma_prepare]
  Link: https://lkml.kernel.org/r/20230301022720.1380780-1-surenb@google.com
  Link: https://lore.kernel.org/r/202302281802.J93Nma7q-lkp@intel.com/
Link: https://lkml.kernel.org/r/20230227173632.3292573-17-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Laurent Dufour <laurent.dufour@fr.ibm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/mm/mmap.c~mm-mmap-write-lock-vmas-in-vma_prepare-before-modifying-them
+++ a/mm/mmap.c
@@ -502,6 +502,15 @@ static inline void init_vma_prep(struct
  */
 static inline void vma_prepare(struct vma_prepare *vp)
 {
+	vma_start_write(vp->vma);
+	if (vp->adj_next)
+		vma_start_write(vp->adj_next);
+	/* vp->insert is always a newly created VMA, no need for locking */
+	if (vp->remove)
+		vma_start_write(vp->remove);
+	if (vp->remove2)
+		vma_start_write(vp->remove2);
+
 	if (vp->file) {
 		uprobe_munmap(vp->vma, vp->vma->vm_start, vp->vma->vm_end);
 
_

Patches currently in -mm which might be from surenb@google.com are