diff --git a/include/linux/sched.h b/include/linux/sched.h
index 253d8ab6256c7604e01e64cd81e3c87f05445e21..aa60812b4b7a643bb6ef09ac1c43f855c1b6cb16 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1242,32 +1242,6 @@ static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
 #define TNF_FAULT_LOCAL	0x08
 #define TNF_MIGRATE_FAIL 0x10
 
-static inline bool in_vfork(struct task_struct *tsk)
-{
-	bool ret;
-
-	/*
-	 * need RCU to access ->real_parent if CLONE_VM was used along with
-	 * CLONE_PARENT.
-	 *
-	 * We check real_parent->mm == tsk->mm because CLONE_VFORK does not
-	 * imply CLONE_VM
-	 *
-	 * CLONE_VFORK can be used with CLONE_PARENT/CLONE_THREAD and thus
-	 * ->real_parent is not necessarily the task doing vfork(), so in
-	 * theory we can't rely on task_lock() if we want to dereference it.
-	 *
-	 * And in this case we can't trust the real_parent->mm == tsk->mm
-	 * check, it can be false negative. But we do not care, if init or
-	 * another oom-unkillable task does this it should blame itself.
-	 */
-	rcu_read_lock();
-	ret = tsk->vfork_done && tsk->real_parent->mm == tsk->mm;
-	rcu_read_unlock();
-
-	return ret;
-}
-
 #ifdef CONFIG_NUMA_BALANCING
 extern void task_numa_fault(int last_node, int node, int pages, int flags);
 extern pid_t task_numa_group_id(struct task_struct *p);
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 93fad9f0f466277175e0a3271dcf9530e58791a4..64d83fa8d93aa9325d5fe72e78e67776d0b7352c 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -121,4 +121,30 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
 #endif
 
+static inline bool in_vfork(struct task_struct *tsk)
+{
+	bool ret;
+
+	/*
+	 * need RCU to access ->real_parent if CLONE_VM was used along with
+	 * CLONE_PARENT.
+	 *
+	 * We check real_parent->mm == tsk->mm because CLONE_VFORK does not
+	 * imply CLONE_VM
+	 *
+	 * CLONE_VFORK can be used with CLONE_PARENT/CLONE_THREAD and thus
+	 * ->real_parent is not necessarily the task doing vfork(), so in
+	 * theory we can't rely on task_lock() if we want to dereference it.
+	 *
+	 * And in this case we can't trust the real_parent->mm == tsk->mm
+	 * check, it can be false negative. But we do not care, if init or
+	 * another oom-unkillable task does this it should blame itself.
+	 */
+	rcu_read_lock();
+	ret = tsk->vfork_done && tsk->real_parent->mm == tsk->mm;
+	rcu_read_unlock();
+
+	return ret;
+}
+
 #endif /* _LINUX_SCHED_MM_H */