+ mm-mremap-unlink-anon_vmas-when-mremap-with-mremap_dontunmap-success-v2.patch added to -mm tree

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The patch titled
     Subject: mm: mremap: unlink anon_vmas when mremap with MREMAP_DONTUNMAP success
has been added to the -mm tree.  Its filename is
     mm-mremap-unlink-anon_vmas-when-mremap-with-mremap_dontunmap-success-v2.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-mremap-unlink-anon_vmas-when-mremap-with-mremap_dontunmap-success-v2.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-mremap-unlink-anon_vmas-when-mremap-with-mremap_dontunmap-success-v2.patch

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------------------------------------------------------
From: Li Xinhai <lixinhai.lxh@xxxxxxxxx>
Subject: mm: mremap: unlink anon_vmas when mremap with MREMAP_DONTUNMAP success

Need to consider the old vma just been partially moved, if so we must keep
the anon_vma links for remaining mapped pages in old vma.

Link: https://lkml.kernel.org/r/20210127083917.309264-2-lixinhai.lxh@xxxxxxxxx
Signed-off-by: Li Xinhai <lixinhai.lxh@xxxxxxxxx>
Cc: Brian Geffon <bgeffon@xxxxxxxxxx>
Cc: Lokesh Gidra <lokeshgidra@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

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

--- a/mm/mremap.c~mm-mremap-unlink-anon_vmas-when-mremap-with-mremap_dontunmap-success-v2
+++ a/mm/mremap.c
@@ -599,7 +599,8 @@ static unsigned long move_vma(struct vm_
 		 * anon_vma links of the old vma is no longer needed after its page
 		 * table has been moved.
 		 */
-		if (new_vma != vma)
+		if (new_vma != vma && vma->vm_start == old_addr &&
+			vma->vm_end == (old_addr + old_len))
 			unlink_anon_vmas(vma);
 
 		/* Because we won't unmap we don't need to touch locked_vm */
_

Patches currently in -mm which might be from lixinhai.lxh@xxxxxxxxx are

mm-rmap-explicitly-reset-vma-anon_vma-in-unlink_anon_vmas.patch
mm-mremap-unlink-anon_vmas-when-mremap-with-mremap_dontunmap-success.patch
mm-mremap-unlink-anon_vmas-when-mremap-with-mremap_dontunmap-success-v2.patch
mm-hugetlbc-fix-unnecessary-address-expansion-of-pmd-sharing.patch




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