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Date:   Thu, 25 Feb 2021 15:10:09 -0800 (PST)
From:   Hugh Dickins <hughd@google.com>
To:     Andrew Morton <akpm@linux-foundation.org>
cc:     Roman Gushchin <guro@fb.com>, Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 1/4] mm: restore node stat checking in
 /proc/sys/vm/stat_refresh
Message-ID: <alpine.LSU.2.11.2102251502240.13363@eggly.anvils>
User-Agent: Alpine 2.11 (LSU 23 2013-08-11)
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v4.7 52b6f46bc163 ("mm: /proc/sys/vm/stat_refresh to force vmstat update")
introduced vmstat_refresh(), with its vmstat underflow checking; then
v4.8 75ef71840539 ("mm, vmstat: add infrastructure for per-node vmstats")
split NR_VM_NODE_STAT_ITEMS out of NR_VM_ZONE_STAT_ITEMS without updating
vmstat_refresh(): so it has been missing out much of the vmstat underflow
checking ever since. Reinstate it. Thanks to Roman Gushchin <guro@fb.com>
for tangentially pointing this out.

Signed-off-by: Hugh Dickins <hughd@google.com>
---

 mm/vmstat.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- 5.12-rc/mm/vmstat.c	2021-02-24 12:03:55.000000000 -0800
+++ vmstat1/mm/vmstat.c	2021-02-25 11:50:36.000000000 -0800
@@ -1857,6 +1857,14 @@ int vmstat_refresh(struct ctl_table *tab
 		}
 	}
 #endif
+	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
+		val = atomic_long_read(&vm_node_stat[i]);
+		if (val < 0) {
+			pr_warn("%s: %s %ld\n",
+				__func__, node_stat_name(i), val);
+			err = -EINVAL;
+		}
+	}
 	if (err)
 		return err;
 	if (write)