From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Tue, 16 Mar 2021 20:00:23 +0000 (-0400)
Subject: oom_kill rcu fix
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=952d7f02ffe853bd05fb4c6e547a4f44c34db680;p=users%2Fjedix%2Flinux-maple.git

oom_kill rcu fix

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

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index dc9cd2a83064..4695adf27603 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -526,6 +526,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
 	 */
 	set_bit(MMF_UNSTABLE, &mm->flags);
 
+	rcu_read_lock();
 	mas_for_each(&mas, vma, ULONG_MAX) {
 		if (!can_madv_lru_vma(vma))
 			continue;
@@ -558,6 +559,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
 			tlb_finish_mmu(&tlb, range.start, range.end);
 		}
 	}
+	rcu_read_unlock();
 
 	return ret;
 }