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From: Xiaoming Ni <nixiaoming@huawei.com>
To: <mcgrof@kernel.org>, <keescook@chromium.org>,
	<yzaikin@google.com>, <adobriyan@gmail.com>, <mingo@kernel.org>,
	<peterz@infradead.org>, <akpm@linux-foundation.org>,
	<yamada.masahiro@socionext.com>, <bauerman@linux.ibm.com>,
	<gregkh@linuxfoundation.org>, <skhan@linuxfoundation.org>,
	<dvyukov@google.com>, <svens@stackframe.org>,
	<joel@joelfernandes.org>, <tglx@linutronix.de>,
	<Jisheng.Zhang@synaptics.com>, <pmladek@suse.com>,
	<bigeasy@linutronix.de>
Cc: <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
	<nixiaoming@huawei.com>, <wangle6@huawei.com>
Subject: [PATCH 4/4] sysctl: Add register_sysctl_init() interface
Date: Fri, 15 May 2020 12:33:44 +0800	[thread overview]
Message-ID: <1589517224-123928-5-git-send-email-nixiaoming@huawei.com> (raw)
In-Reply-To: <1589517224-123928-1-git-send-email-nixiaoming@huawei.com>

In order to eliminate the duplicate code for registering the sysctl
interface during the initialization of each feature, add the
register_sysctl_init() interface

Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
---
 include/linux/sysctl.h    |  2 ++
 kernel/hung_task_sysctl.c | 15 +--------------
 kernel/sysctl.c           | 19 +++++++++++++++++++
 kernel/watchdog.c         | 18 +-----------------
 4 files changed, 23 insertions(+), 31 deletions(-)

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 6d741d6..3cdbe89 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -207,6 +207,8 @@ struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
 void unregister_sysctl_table(struct ctl_table_header * table);
 
 extern int sysctl_init(void);
+extern void register_sysctl_init(const char *path, struct ctl_table *table,
+				 const char *table_name);
 
 extern struct ctl_table sysctl_mount_point[];
 
diff --git a/kernel/hung_task_sysctl.c b/kernel/hung_task_sysctl.c
index 62a51f5..14d2ed6 100644
--- a/kernel/hung_task_sysctl.c
+++ b/kernel/hung_task_sysctl.c
@@ -59,21 +59,8 @@
 	{}
 };
 
-/*
- * The hung task sysctl has a default value.
- * Even if register_sysctl() fails, it does not affect the main function of
- * the hung task. At the same time, during the system initialization phase,
- * malloc small memory will almost never fail.
- * So the return value is ignored here
- */
 void __init hung_task_sysctl_init(void)
 {
-	struct ctl_table_header *srt = register_sysctl("kernel", hung_task_sysctls);
-
-	if (unlikely(!srt)) {
-		pr_err("%s fail\n", __func__);
-		return;
-	}
-	kmemleak_not_leak(srt);
+	register_sysctl_init("kernel", hung_task_sysctls, "hung_task_sysctls");
 }
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index e394990..0a09742 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1823,6 +1823,25 @@ int __init sysctl_init(void)
 	return 0;
 }
 
+/*
+ * The sysctl interface is used to modify the interface value,
+ * but the feature interface has default values. Even if register_sysctl fails,
+ * the feature body function can also run. At the same time, malloc small
+ * fragment of memory during the system initialization phase, almost does
+ * not fail. Therefore, the function return is designed as void
+ */
+void __init register_sysctl_init(const char *path, struct ctl_table *table,
+				 const char *table_name)
+{
+	struct ctl_table_header *hdr = register_sysctl(path, table);
+
+	if (unlikely(!hdr)) {
+		pr_err("failed when register_sysctl %s to %s\n", table_name, path);
+		return;
+	}
+	kmemleak_not_leak(hdr);
+}
+
 #endif /* CONFIG_SYSCTL */
 
 /*
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 05e1d58..c1bebb1 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -23,9 +23,6 @@
 #include <linux/sched/debug.h>
 #include <linux/sched/isolation.h>
 #include <linux/stop_machine.h>
-#ifdef CONFIG_SYSCTL
-#include <linux/kmemleak.h>
-#endif
 
 #include <asm/irq_regs.h>
 #include <linux/kvm_para.h>
@@ -853,22 +850,9 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write,
 	{}
 };
 
-/*
- * The watchdog sysctl has a default value.
- * Even if register_sysctl() fails, it does not affect the main function of
- * the watchdog. At the same time, during the system initialization phase,
- * malloc small memory will almost never fail.
- * So the return value is ignored here
- */
 static void __init watchdog_sysctl_init(void)
 {
-	struct ctl_table_header *p = register_sysctl("kernel", watchdog_sysctls);
-
-	if (unlikely(!p)) {
-		pr_err("%s fail\n", __func__);
-		return;
-	}
-	kmemleak_not_leak(p);
+	register_sysctl_init("kernel", watchdog_sysctls, "watchdog_sysctls");
 }
 #else
 #define watchdog_sysctl_init() do { } while (0)
-- 
1.8.5.6


  parent reply	other threads:[~2020-05-15  4:34 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15  4:33 [PATCH 0/4] Move the sysctl interface to the corresponding feature code file Xiaoming Ni
2020-05-15  4:33 ` [PATCH 1/4] hung_task: Move hung_task sysctl interface to hung_task_sysctl.c Xiaoming Ni
2020-05-15  8:04   ` Kees Cook
2020-05-15  8:56     ` Xiaoming Ni
2020-05-15 16:03       ` Kees Cook
2020-05-15 20:21         ` Luis Chamberlain
2020-05-15  4:33 ` [PATCH 2/4] proc/sysctl: add shared variables -1 Xiaoming Ni
2020-05-15  8:06   ` Kees Cook
2020-05-15  9:06     ` Xiaoming Ni
2020-05-15 16:05       ` Kees Cook
2020-05-16  2:32         ` Xiaoming Ni
2020-05-16  2:47           ` Kees Cook
2020-05-16  3:05             ` Xiaoming Ni
2020-05-17  2:38               ` Kees Cook
2020-05-15  4:33 ` [PATCH 3/4] watchdog: move watchdog sysctl to watchdog.c Xiaoming Ni
2020-05-15  8:09   ` Kees Cook
2020-05-15  9:17     ` Xiaoming Ni
2020-05-15  4:33 ` Xiaoming Ni [this message]
2020-05-15  8:10   ` [PATCH 4/4] sysctl: Add register_sysctl_init() interface Kees Cook
2020-05-15  9:39     ` Xiaoming Ni

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