linux-kernel - [PATCH v2 7/9] epoll: delete these unnecessary static variables long_zero and long

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Message-ID: <tencent_8A661504B57950D1A4423A387393DFD63306@qq.com>
Date: Sat,  9 Mar 2024 18:31:24 +0800
From: wenyang.linux@...mail.com
To: "Eric W . Biederman" <ebiederm@...ssion.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Joel Granados <j.granados@...sung.com>,
	Christian Brauner <brauner@...nel.org>
Cc: Wen Yang <wenyang.linux@...mail.com>,
	Jan Kara <jack@...e.cz>,
	"Darrick J. Wong" <djwong@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 7/9] epoll: delete these unnecessary static variables long_zero and long_max

From: Wen Yang <wenyang.linux@...mail.com>

Delete unnecessary static variables (long_zero and long_max)
and encode them directly in the table entry.

Signed-off-by: Wen Yang <wenyang.linux@...mail.com>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Luis Chamberlain <mcgrof@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Joel Granados <j.granados@...sung.com>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Jan Kara <jack@...e.cz>
Cc: "Darrick J. Wong" <djwong@...nel.org>
Cc: linux-kernel@...r.kernel.org
---
 fs/eventpoll.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 3534d36a1474..7cfc4fb0ca3c 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -309,19 +309,14 @@ static void unlist_file(struct epitems_head *head)
 
 #include <linux/sysctl.h>
 
-static long long_zero;
-static long long_max = LONG_MAX;
-
 static struct ctl_table epoll_table[] = {
-	{
-		.procname	= "max_user_watches",
-		.data		= &max_user_watches,
-		.maxlen		= sizeof(max_user_watches),
-		.mode		= 0644,
-		.proc_handler	= proc_doulongvec_minmax,
-		.extra1		= &long_zero,
-		.extra2		= &long_max,
-	},
+	CTL_TABLE_ENTRY_MINMAX("max_user_watches",
+				&max_user_watches,
+				sizeof(max_user_watches),
+				0644,
+				proc_doulongvec_minmax,
+				SYSCTL_NUMERIC_ZERO,
+				SYSCTL_NUMERIC_LONG_MAX),
 };
 
 static void __init epoll_sysctls_init(void)
-- 
2.25.1