+ mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch added to -mm tree

+ mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/vmstat.c: do not show lowmem reserve protection information of empty zone
has been added to the -mm tree.  Its filename is
     mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch

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------------------------------------------------------
From: Baoquan He <bhe@redhat.com>
Subject: mm/vmstat.c: do not show lowmem reserve protection information of empty zone

Because the lowmem reserve protection of a zone can't tell anything if the
zone is empty, except of adding one more line in /proc/zoneinfo.

Let's remove it from that zone's showing.

Link: http://lkml.kernel.org/r/20200402140113.3696-4-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmstat.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/mm/vmstat.c~mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone
+++ a/mm/vmstat.c
@@ -1590,6 +1590,12 @@ static void zoneinfo_show_print(struct s
 		   zone->present_pages,
 		   zone_managed_pages(zone));
 
+	/* If unpopulated, no other information is useful */
+	if (!populated_zone(zone)) {
+		seq_putc(m, '\n');
+		return;
+	}
+
 	seq_printf(m,
 		   "\n        protection: (%ld",
 		   zone->lowmem_reserve[0]);
@@ -1597,12 +1603,6 @@ static void zoneinfo_show_print(struct s
 		seq_printf(m, ", %ld", zone->lowmem_reserve[i]);
 	seq_putc(m, ')');
 
-	/* If unpopulated, no other information is useful */
-	if (!populated_zone(zone)) {
-		seq_putc(m, '\n');
-		return;
-	}