From: Liam R. Howlett <Liam.Howlett@oracle.com>
Date: Thu, 21 Apr 2022 21:41:19 +0000 (-0400)
Subject: mm/mmap.c: Fix mmap_write_lock() order in exit_mmap() for oom
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f60bbb423920aff969662f47d92c00b25e7c8cb5;p=users%2Fjedix%2Flinux-maple.git

mm/mmap.c: Fix mmap_write_lock() order in exit_mmap() for oom

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

diff --git a/mm/mmap.c b/mm/mmap.c
index 01dd9af0b13e..1d9d88d52390 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3114,6 +3114,7 @@ void exit_mmap(struct mm_struct *mm)
 	/* mm's last user has gone, and its about to be pulled down */
 	mmu_notifier_release(mm);
 
+	mmap_write_lock(mm);
 	if (unlikely(mm_is_oom_victim(mm))) {
 		/*
 		 * Manually reap the mm to free as much memory as possible.
@@ -3131,9 +3132,7 @@ void exit_mmap(struct mm_struct *mm)
 		set_bit(MMF_OOM_SKIP, &mm->flags);
 	}
 
-	mmap_write_lock(mm);
 	arch_exit_mmap(mm);
-
 	vma = mas_find(&mas, ULONG_MAX);
 	if (!vma) {
 		/* Can happen if dup_mmap() received an OOM */