From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Tue, 16 Mar 2021 19:55:54 +0000 (-0400)
Subject: ppc book3s32: Fix tlb rcu lock
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=592597fd867be0b11eb98e8c9a133dc77f4fb9ed;p=users%2Fjedix%2Flinux-maple.git

ppc book3s32: Fix tlb rcu lock

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

diff --git a/arch/powerpc/mm/book3s32/tlb.c b/arch/powerpc/mm/book3s32/tlb.c
index 382c6316c94e..7920eb7ce3b3 100644
--- a/arch/powerpc/mm/book3s32/tlb.c
+++ b/arch/powerpc/mm/book3s32/tlb.c
@@ -89,8 +89,10 @@ void hash__flush_tlb_mm(struct mm_struct *mm)
 	 * unmap_region or exit_mmap, but not from vmtruncate on SMP -
 	 * but it seems dup_mmap is the only SMP case which gets here.
 	 */
+	rcu_read_lock();
 	mas_for_each(&mas, mp, ULONG_MAX)
 		flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
+	rcu_read_unlock();
 }
 EXPORT_SYMBOL(hash__flush_tlb_mm);