mm: do some clean up of accounting ReliableTaskUsed

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4PM0X
CVE: NA

-----------------------------------------

Clean up redundant code of accounting ReliableTaskUsed.
Signed-off-by: NPeng Wu <wupeng58@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/linux/mem_reliable.h

@@ -15,7 +15,6 @@
 extern struct static_key_false mem_reliable;
 
 extern bool reliable_enabled;
-extern atomic_long_t reliable_task_used_nr_page;
 extern unsigned long task_reliable_limit __read_mostly;
 extern bool reliable_allow_fallback;
 extern bool shmem_reliable;
@@ -76,10 +75,8 @@ static inline bool skip_none_movable_zone(gfp_t gfp, struct zoneref *z)
 static inline void reliable_page_counter(struct page *page,
 		struct mm_struct *mm, int val)
 {
-	if (page_reliable(page)) {
+	if (page_reliable(page))
 		atomic_long_add(val, &mm->reliable_nr_page);
-		atomic_long_add(val, &reliable_task_used_nr_page);
-	}
 }
 
 static inline bool reliable_mem_limit_check(unsigned long nr_page)

mm/mem_reliable.c

@@ -24,7 +24,6 @@ DEFINE_STATIC_KEY_FALSE(mem_reliable);
 
 bool reliable_enabled;
 static atomic_long_t total_reliable_mem;
-atomic_long_t reliable_task_used_nr_page;
 /* reliable user limit for user tasks with reliable flag */
 unsigned long task_reliable_limit = ULONG_MAX;
 bool reliable_allow_fallback __read_mostly = true;