cgroup/cpuset: move memory_spread to cpuset-v1.c

'memory_spread' is only set in cpuset v1. move corresponding code into
cpuset-v1.c.

Currently, 'cpuset_update_task_spread_flags' and 'update_tasks_flags' are
exposed to cpuset.c.
Signed-off-by: Chen Ridong <chenridong@huawei.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/cgroup/cpuset-internal.h

@@ -248,5 +248,8 @@ int fmeter_getrate(struct fmeter *fmp);
 int cpuset_write_s64(struct cgroup_subsys_state *css, struct cftype *cft,
 			    s64 val);
 s64 cpuset_read_s64(struct cgroup_subsys_state *css, struct cftype *cft);
+void cpuset_update_task_spread_flags(struct cpuset *cs,
+					struct task_struct *tsk);
+void update_tasks_flags(struct cpuset *cs);
 
 #endif /* __CPUSET_INTERNAL_H */

kernel/cgroup/cpuset-v1.c

@@ -194,3 +194,45 @@ s64 cpuset_read_s64(struct cgroup_subsys_state *css, struct cftype *cft)
 	/* Unreachable but makes gcc happy */
 	return 0;
 }
+
+/*
+ * update task's spread flag if cpuset's page/slab spread flag is set
+ *
+ * Call with callback_lock or cpuset_mutex held. The check can be skipped
+ * if on default hierarchy.
+ */
+void cpuset_update_task_spread_flags(struct cpuset *cs,
+					struct task_struct *tsk)
+{
+	if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys))
+		return;
+
+	if (is_spread_page(cs))
+		task_set_spread_page(tsk);
+	else
+		task_clear_spread_page(tsk);
+
+	if (is_spread_slab(cs))
+		task_set_spread_slab(tsk);
+	else
+		task_clear_spread_slab(tsk);
+}
+
+/**
+ * update_tasks_flags - update the spread flags of tasks in the cpuset.
+ * @cs: the cpuset in which each task's spread flags needs to be changed
+ *
+ * Iterate through each task of @cs updating its spread flags.  As this
+ * function is called with cpuset_mutex held, cpuset membership stays
+ * stable.
+ */
+void update_tasks_flags(struct cpuset *cs)
+{
+	struct css_task_iter it;
+	struct task_struct *task;
+
+	css_task_iter_start(&cs->css, 0, &it);
+	while ((task = css_task_iter_next(&it)))
+		cpuset_update_task_spread_flags(cs, task);
+	css_task_iter_end(&it);
+}

kernel/cgroup/cpuset.c

@@ -407,29 +407,6 @@ static void guarantee_online_mems(struct cpuset *cs, nodemask_t *pmask)
 	nodes_and(*pmask, cs->effective_mems, node_states[N_MEMORY]);
 }
 
-/*
- * update task's spread flag if cpuset's page/slab spread flag is set
- *
- * Call with callback_lock or cpuset_mutex held. The check can be skipped
- * if on default hierarchy.
- */
-static void cpuset_update_task_spread_flags(struct cpuset *cs,
-					struct task_struct *tsk)
-{
-	if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys))
-		return;
-
-	if (is_spread_page(cs))
-		task_set_spread_page(tsk);
-	else
-		task_clear_spread_page(tsk);
-
-	if (is_spread_slab(cs))
-		task_set_spread_slab(tsk);
-	else
-		task_clear_spread_slab(tsk);
-}
-
 /*
  * is_cpuset_subset(p, q) - Is cpuset p a subset of cpuset q?
  *
@@ -2794,25 +2771,6 @@ bool current_cpuset_is_being_rebound(void)
 	return ret;
 }
 
-/**
- * update_tasks_flags - update the spread flags of tasks in the cpuset.
- * @cs: the cpuset in which each task's spread flags needs to be changed
- *
- * Iterate through each task of @cs updating its spread flags.  As this
- * function is called with cpuset_mutex held, cpuset membership stays
- * stable.
- */
-static void update_tasks_flags(struct cpuset *cs)
-{
-	struct css_task_iter it;
-	struct task_struct *task;
-
-	css_task_iter_start(&cs->css, 0, &it);
-	while ((task = css_task_iter_next(&it)))
-		cpuset_update_task_spread_flags(cs, task);
-	css_task_iter_end(&it);
-}
-
 /*
  * update_flag - read a 0 or a 1 in a file and update associated flag
  * bit:		the bit to update (see cpuset_flagbits_t)