+ mm-start-tracking-vmas-with-maple-tree-fix.patch added to -mm tree

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

The patch titled
     Subject: mm: fix commit "mm: start tracking VMAs with maple tree"
has been added to the -mm tree.  Its filename is
     mm-start-tracking-vmas-with-maple-tree-fix.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-start-tracking-vmas-with-maple-tree-fix.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-start-tracking-vmas-with-maple-tree-fix.patch

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------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Subject: mm: fix commit "mm: start tracking VMAs with maple tree"

Hold the lock for the destruction of the maple tree to avoid lockdep
issues - and potentially process_mrelease.

Link: https://lkml.kernel.org/r/20220420134336.bny7wza3ez2ldjsd@revolver
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/mmap.c~mm-start-tracking-vmas-with-maple-tree-fix
+++ a/mm/mmap.c
@@ -3319,9 +3319,9 @@ void exit_mmap(struct mm_struct *mm)
 		cond_resched();
 	}
 	mm->mmap = NULL;
-	mmap_write_unlock(mm);
 	trace_exit_mmap(mm);
 	__mt_destroy(&mm->mm_mt);
+	mmap_write_unlock(mm);
 	vm_unacct_memory(nr_accounted);
 }
 
_

Patches currently in -mm which might be from Liam.Howlett@oracle.com are

maple-tree-add-new-data-structure-fix-2.patch
mm-start-tracking-vmas-with-maple-tree-fix.patch