From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Tue, 16 Mar 2021 19:59:57 +0000 (-0400)
Subject: memory rcu fix
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=8d7a8c86eeae8e2805e11e081b51420c0ccd20b4;p=users%2Fjedix%2Flinux-maple.git

memory rcu fix

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

diff --git a/mm/memory.c b/mm/memory.c
index c3a0605aeba0..2ffbcb53fa9d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1551,8 +1551,10 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
 	tlb_gather_mmu(&tlb, vma->vm_mm, start, end);
 	update_hiwater_rss(vma->vm_mm);
 	mmu_notifier_invalidate_range_start(&range);
+	rcu_read_lock();
 	mas_for_each(&mas, vma, end - 1)
 		unmap_single_vma(&tlb, vma, start, end, NULL);
+	rcu_read_unlock();
 
 	mmu_notifier_invalidate_range_end(&range);
 	tlb_finish_mmu(&tlb, start, end);