linux-kernel - [PATCH] tools/sched_ext: scx_nest: zero-initialize stats counter array

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Message-ID: <20260211215213.917724-1-devnexen@gmail.com>
Date: Wed, 11 Feb 2026 21:52:13 +0000
From: David Carlier <devnexen@...il.com>
To: Tejun Heo <tj@...nel.org>,
	David Vernet <dvernet@...a.com>
Cc: linux-kernel@...r.kernel.org,
	David Carlier <devnexen@...il.com>
Subject: [PATCH] tools/sched_ext: scx_nest: zero-initialize stats counter array

The local cnts array in read_stats() is not initialized before being
accumulated into per-CPU stats, which may lead to reading garbage
values. Zero it out with memset alongside the existing stats array
initialization.

Signed-off-by: David Carlier <devnexen@...il.com>
---
 tools/sched_ext/scx_flatcg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/sched_ext/scx_flatcg.c b/tools/sched_ext/scx_flatcg.c
index cd85eb401179..bea76d060201 100644
--- a/tools/sched_ext/scx_flatcg.c
+++ b/tools/sched_ext/scx_flatcg.c
@@ -106,6 +106,7 @@ static void fcg_read_stats(struct scx_flatcg *skel, __u64 *stats)
 	__u32 idx;
 
 	memset(stats, 0, sizeof(stats[0]) * FCG_NR_STATS);
+	memset(cnts, 0, sizeof(cnts));
 
 	for (idx = 0; idx < FCG_NR_STATS; idx++) {
 		int ret, cpu;
-- 
2.51.0