From: Liam R. Howlett <Liam.Howlett@oracle.com>
Date: Wed, 20 Apr 2022 13:37:50 +0000 (-0400)
Subject: mm: Fix commit "mm: start tracking VMAs with maple tree"
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=refs%2Fheads%2Fmglru-mapletree;p=users%2Fjedix%2Flinux-maple.git

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.

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---

diff --git a/mm/mmap.c b/mm/mmap.c
index f172f3aba90f..dbfd3576b6d0 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3163,9 +3163,9 @@ void exit_mmap(struct mm_struct *mm)
 
 	BUG_ON(count != mm->map_count);
 
-	mmap_write_unlock(mm);
 	trace_exit_mmap(mm);
 	__mt_destroy(&mm->mm_mt);
+	mmap_write_unlock(mm);
 	vm_unacct_memory(nr_accounted);
 }