From a2c375789aa6c83fc85b8f528ee6d7d5f5666941 Mon Sep 17 00:00:00 2001
From: Zhan Xusheng <zhanxusheng1024@gmail.com>
Date: Wed, 23 Sep 2026 22:49:36 +0800
Subject: [PATCH] sysctl: Add jiffies converter entries to the test module

lib/test_sysctl.c covers proc_dointvec(), proc_douintvec(),
proc_dostring(), proc_do_large_bitmap() and proc_dou8vec_minmax(), but
none of the jiffies converters.  Their int paths report the sign
separately from the magnitude, which is a shape the existing entries do
not exercise at all.

Add one entry per affected int converter: proc_dointvec_jiffies(),
proc_dointvec_ms_jiffies() and proc_dointvec_userhz_jiffies().  Each is
seeded with HZ jiffies, which is one second in every converter's own
unit, so the three read back as 1, 1000 and 100 respectively.

Signed-off-by: Zhan Xusheng <zhanxusheng@xiaomi.com>
Reviewed-by: Bradley Morgan <brads@mainlining.org>
Tested-by: Bradley Morgan <brads@mainlining.org> # POWER10
Signed-off-by: Joel Granados <joel.granados@kernel.org>
---
 lib/test_sysctl.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/lib/test_sysctl.c b/lib/test_sysctl.c
index dd795979558a..65ce42346170 100644
--- a/lib/test_sysctl.c
+++ b/lib/test_sysctl.c
@@ -15,6 +15,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/init.h>
+#include <linux/jiffies.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/printk.h>
@@ -48,6 +49,10 @@ struct test_sysctl_data {
 
 	int boot_int;
 
+	int int_jiffies;
+	int int_ms_jiffies;
+	int int_userhz_jiffies;
+
 	unsigned int uint_0001;
 
 	char string_0001[65];
@@ -67,6 +72,11 @@ static struct test_sysctl_data test_data = {
 
 	.boot_int = 0,
 
+	/* One second in each converter's unit; all three store HZ jiffies. */
+	.int_jiffies = HZ,
+	.int_ms_jiffies = HZ,
+	.int_userhz_jiffies = HZ,
+
 	.uint_0001 = 314,
 
 	.string_0001 = "(none)",
@@ -113,6 +123,27 @@ static const struct ctl_table test_table[] = {
 		.extra1		= SYSCTL_ZERO,
 		.extra2         = SYSCTL_ONE,
 	},
+	{
+		.procname	= "int_jiffies",
+		.data		= &test_data.int_jiffies,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_jiffies,
+	},
+	{
+		.procname	= "int_ms_jiffies",
+		.data		= &test_data.int_ms_jiffies,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_ms_jiffies,
+	},
+	{
+		.procname	= "int_userhz_jiffies",
+		.data		= &test_data.int_userhz_jiffies,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_userhz_jiffies,
+	},
 	{
 		.procname	= "uint_0001",
 		.data		= &test_data.uint_0001,