linux-kernel - [PATCH v4 5/5] sysctl: delete six_hundred_forty

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Message-Id: <20d67551ed7fa9c774d2b128ad9bc298a0a55c9d.1726910671.git.wen.yang@linux.dev>
Date: Sat, 21 Sep 2024 17:29:04 +0800
From: Wen Yang <wen.yang@...ux.dev>
To: "Eric W . Biederman" <ebiederm@...ssion.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Joel Granados <j.granados@...sung.com>
Cc: Christian Brauner <brauner@...nel.org>,
	Thomas Weißschuh <thomas@...ch.de>,
	linux-kernel@...r.kernel.org,
	Wen Yang <wen.yang@...ux.dev>,
	Dave Young <dyoung@...hat.com>
Subject: [PATCH v4 5/5] sysctl: delete six_hundred_forty_kb to save 4 bytes

By directly encoding specific numbers into the min/max field,
unnecessary global variable six_hundred_forty_kb can be removed,
saving 4 bytes

Signed-off-by: Wen Yang <wen.yang@...ux.dev>
Cc: Luis Chamberlain <mcgrof@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Joel Granados <j.granados@...sung.com>
Cc: Thomas Weißschuh <thomas@...ch.de>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Dave Young <dyoung@...hat.com>
Cc: linux-kernel@...r.kernel.org
---
 kernel/sysctl.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 05197d46007d..c8460b5e0605 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -90,13 +90,6 @@ EXPORT_SYMBOL_GPL(sysctl_long_vals);
 
 #if defined(CONFIG_SYSCTL)
 
-/* Constants used for minimum and maximum */
-
-#ifdef CONFIG_PERF_EVENTS
-static const int six_hundred_forty_kb = 640 * 1024;
-#endif
-
-
 static const int ngroups_max = NGROUPS_MAX;
 static const int cap_last_cap = CAP_LAST_CAP;
 
@@ -1964,10 +1957,10 @@ static struct ctl_table kern_table[] = {
 		.procname	= "perf_event_max_stack",
 		.data		= &sysctl_perf_event_max_stack,
 		.maxlen		= sizeof(sysctl_perf_event_max_stack),
-		.mode		= 0644,
+		.mode		= 0644 | SYSCTL_FLAG_MIN | SYSCTL_FLAG_MAX,
 		.proc_handler	= perf_event_max_stack_handler,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= (void *)&six_hundred_forty_kb,
+		.min		= 0,
+		.max		= 640 * 1024,
 	},
 	{
 		.procname	= "perf_event_max_contexts_per_stack",
-- 
2.25.1