mm: Fix reliable task used problem shown in meminfo

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

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

Previous reliable task used does not contains reliable pagecache pages if
pagecache use reliable memory feature is disabled. This will lead to
incorrect result because reliable task's pagecache is allocated from
mirrored region.

With this patch, reliable task used will always contains reliable anon
pages and reliable pagecache pages.
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

mm/mem_reliable.c

@@ -196,7 +196,6 @@ static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
 
 void reliable_report_meminfo(struct seq_file *m)
 {
-	bool pagecache_enabled = pagecache_reliable_is_enabled();
 	s64 nr_pagecache_pages = 0;
 	s64 nr_anon_pages = 0;
 	long nr_buddy_pages = 0;
@@ -209,8 +208,7 @@ void reliable_report_meminfo(struct seq_file *m)
 		nr_buddy_pages += per_cpu(nr_reliable_buddy_pages, cpu);
 
 	nr_anon_pages = percpu_counter_sum_positive(&anon_reliable_pages);
-	if (pagecache_enabled)
-		nr_pagecache_pages = percpu_counter_sum_positive(&pagecache_reliable_pages);
+	nr_pagecache_pages = percpu_counter_sum_positive(&pagecache_reliable_pages);
 
 	show_val_kb(m, "ReliableTotal:    ",
 			total_reliable_mem_sz() >> PAGE_SHIFT);
@@ -224,7 +222,7 @@ void reliable_report_meminfo(struct seq_file *m)
 			    percpu_counter_sum(&reliable_shmem_used_nr_page));
 	}
 
-	if (pagecache_enabled) {
+	if (pagecache_reliable_is_enabled()) {
 		unsigned long num = 0;
 
 		num += global_node_page_state(NR_LRU_BASE + LRU_ACTIVE_FILE);