From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Tue, 16 Mar 2021 19:57:06 +0000 (-0400)
Subject: xtensa rcu fix
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=30bd423f4d9f77af78264d6582afda3670e2cb41;p=users%2Fjedix%2Flinux-maple.git

xtensa rcu fix

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

diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
index 26ec2e67879a..490d71c907f4 100644
--- a/arch/xtensa/kernel/syscall.c
+++ b/arch/xtensa/kernel/syscall.c
@@ -84,6 +84,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	else
 		addr = PAGE_ALIGN(addr);
 
+	/* Must hold mm_mt lock */
 	mas_for_each(&mas, vmm, ULONG_MAX) {
 		/* At this point:  (!vmm || addr < vmm->vm_end). */
 		if (TASK_SIZE - len < addr)