mm: hide incomplete nr_indirectly_reclaimable in sysfs

In upstream branch this fixed by commit b29940c1abd7 ("mm: rename and
change semantics of nr_indirectly_reclaimable_bytes").

This fixes /sys/devices/system/node/node*/vmstat format:

...
nr_dirtied 6613155
nr_written 5796802
 11089216
...

Cc: <stable@vger.kernel.org> # 4.19.y
Fixes: 7aaf7727 ("mm: don't show nr_indirectly_reclaimable in /proc/vmstat")
Signed-off-by: NKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Roman Gushchin <guro@fb.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/node.c

@@ -197,11 +197,16 @@ static ssize_t node_read_vmstat(struct device *dev,
 			     sum_zone_numa_state(nid, i));
 #endif
 
-	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
+	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
+		/* Skip hidden vmstat items. */
+		if (*vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
+				 NR_VM_NUMA_STAT_ITEMS] == '\0')
+			continue;
 		n += sprintf(buf+n, "%s %lu\n",
 			     vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
 			     NR_VM_NUMA_STAT_ITEMS],
 			     node_page_state(pgdat, i));
+	}
 
 	return n;
 }