From b9a6330da35b8bf87d21c2d78aa3dbcb887c23c6 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Fri, 24 Jan 2020 13:05:53 +0000
Subject: [PATCH] Implement mmget_not_zero() in the LinuxKPI.

Submitted by:	Austin Shafer <ashafer@badland.io>
MFC after:	1 week
Sponsored by:	Mellanox Technologies
---
 sys/compat/linuxkpi/common/include/linux/mm_types.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/mm_types.h b/sys/compat/linuxkpi/common/include/linux/mm_types.h
index 5529c0afe0d8..4c9eddf500d6 100644
--- a/sys/compat/linuxkpi/common/include/linux/mm_types.h
+++ b/sys/compat/linuxkpi/common/include/linux/mm_types.h
@@ -57,6 +57,12 @@ mmdrop(struct mm_struct *mm)
 		linux_mm_dtor(mm);
 }
 
+static inline bool
+mmget_not_zero(struct mm_struct *mm)
+{
+	return (atomic_inc_not_zero(&mm->mm_users));
+}
+
 static inline void
 mmput(struct mm_struct *mm)
 {