mm: memcg: rename charge move-related functions

Rename exported function related to the charge move to have the memcg1_
prefix.

Link: https://lkml.kernel.org/r/20240625005906.106920-6-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/memcontrol-v1.c

@@ -384,7 +384,7 @@ static bool mem_cgroup_under_move(struct mem_cgroup *memcg)
 	return ret;
 }
 
-bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg)
+bool memcg1_wait_acct_move(struct mem_cgroup *memcg)
 {
 	if (mc.moving_task && current != mc.moving_task) {
 		if (mem_cgroup_under_move(memcg)) {
@@ -1056,7 +1056,7 @@ static void mem_cgroup_clear_mc(void)
 	mmput(mm);
 }
 
-int mem_cgroup_can_attach(struct cgroup_taskset *tset)
+int memcg1_can_attach(struct cgroup_taskset *tset)
 {
 	struct cgroup_subsys_state *css;
 	struct mem_cgroup *memcg = NULL; /* unneeded init to make gcc happy */
@@ -1126,7 +1126,7 @@ int mem_cgroup_can_attach(struct cgroup_taskset *tset)
 	return ret;
 }
 
-void mem_cgroup_cancel_attach(struct cgroup_taskset *tset)
+void memcg1_cancel_attach(struct cgroup_taskset *tset)
 {
 	if (mc.to)
 		mem_cgroup_clear_mc();
@@ -1285,7 +1285,7 @@ static void mem_cgroup_move_charge(void)
 	atomic_dec(&mc.from->moving_account);
 }
 
-void mem_cgroup_move_task(void)
+void memcg1_move_task(void)
 {
 	if (mc.to) {
 		mem_cgroup_move_charge();
@@ -1294,14 +1294,14 @@ void mem_cgroup_move_task(void)
 }
 
 #else	/* !CONFIG_MMU */
-static int mem_cgroup_can_attach(struct cgroup_taskset *tset)
+int memcg1_can_attach(struct cgroup_taskset *tset)
 {
 	return 0;
 }
-static void mem_cgroup_cancel_attach(struct cgroup_taskset *tset)
+void memcg1_cancel_attach(struct cgroup_taskset *tset)
 {
 }
-static void mem_cgroup_move_task(void)
+void memcg1_move_task(void)
 {
 }
 #endif

mm/memcontrol-v1.h

@@ -29,11 +29,11 @@ static inline int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
 void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n);
 void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n);
 
-bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg);
+bool memcg1_wait_acct_move(struct mem_cgroup *memcg);
 struct cgroup_taskset;
-int mem_cgroup_can_attach(struct cgroup_taskset *tset);
-void mem_cgroup_cancel_attach(struct cgroup_taskset *tset);
-void mem_cgroup_move_task(void);
+int memcg1_can_attach(struct cgroup_taskset *tset);
+void memcg1_cancel_attach(struct cgroup_taskset *tset);
+void memcg1_move_task(void);
 
 struct cftype;
 u64 mem_cgroup_move_charge_read(struct cgroup_subsys_state *css,

mm/memcontrol.c

@@ -2580,7 +2580,7 @@ int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
 	 * At task move, charge accounts can be doubly counted. So, it's
 	 * better to wait until the end of task_move if something is going on.
 	 */
-	if (mem_cgroup_wait_acct_move(mem_over_limit))
+	if (memcg1_wait_acct_move(mem_over_limit))
 		goto retry;
 
 	if (nr_retries--)
@@ -5995,12 +5995,12 @@ struct cgroup_subsys memory_cgrp_subsys = {
 	.css_free = mem_cgroup_css_free,
 	.css_reset = mem_cgroup_css_reset,
 	.css_rstat_flush = mem_cgroup_css_rstat_flush,
-	.can_attach = mem_cgroup_can_attach,
+	.can_attach = memcg1_can_attach,
 #if defined(CONFIG_LRU_GEN) || defined(CONFIG_MEMCG_KMEM)
 	.attach = mem_cgroup_attach,
 #endif
-	.cancel_attach = mem_cgroup_cancel_attach,
-	.post_attach = mem_cgroup_move_task,
+	.cancel_attach = memcg1_cancel_attach,
+	.post_attach = memcg1_move_task,
 #ifdef CONFIG_MEMCG_KMEM
 	.fork = mem_cgroup_fork,
 	.exit = mem_cgroup_exit,