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@xxxxxxxxxx>
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@xxxxxxxxxx: remove unnecessary vp->vma check in vma_prepare]
Link: https://lkml.kernel.org/r/20230301022720.1380780-1-surenb@xxxxxxxxxx
Link: https://lore.kernel.org/r/202302281802.J93Nma7q-lkp@xxxxxxxxx/
Link: https://lkml.kernel.org/r/20230227173632.3292573-17-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Laurent Dufour <laurent.dufour@xxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
