The patch titled
Subject: Revert "mm/vmstat.c: do not show lowmem reserve protection information of empty zone"
has been added to the -mm tree. Its filename is
revert-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/revert-mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/revert-mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: Revert "mm/vmstat.c: do not show lowmem reserve protection information of empty zone"
This reverts commit 26e7deadaae175.
Sonny reported that one of their tests started failing on the latest
kernel on their Chrome OS platform. The root cause is that the above
commit removed the protection line of empty zone, while the parser used in
the test relies on the protection line to mark the end of each zone.
Let's revert it to avoid breaking userspace testing or applications.
Link: http://lkml.kernel.org/r/20200811075412.12872-1-bhe@xxxxxxxxxx
Fixes: 26e7deadaae175 ("mm/vmstat.c: do not show lowmem reserve protection information of empty zone)"
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Reported-by: Sonny Rao <sonnyrao@xxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [5.8.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmstat.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/mm/vmstat.c~revert-mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone
+++ a/mm/vmstat.c
@@ -1618,12 +1618,6 @@ 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]);
@@ -1631,6 +1625,12 @@ 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;
+ }
+
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
seq_printf(m, "\n %-12s %lu", zone_stat_name(i),
zone_page_state(zone, i));
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
revert-mm-vmstatc-do-not-show-lowmem-reserve-protection-information-of-empty-zone.patch
