Subject: [PATCH 11/13] random: simplify sysctl declaration with register_sysctl_subdir()

From: Luis Chamberlain <[email-masked]>
Date: Fri, 29 May 2020 07:41:06 +0000

From: Xiaoming Ni <[email-masked]>

Move random_table sysctl from kernel/sysctl.c to drivers/char/random.c
and use register_sysctl_subdir() to help remove the clutter out of
kernel/sysctl.c.

Signed-off-by: Xiaoming Ni <[email-masked]>
Signed-off-by: Luis Chamberlain <[email-masked]>
---
 drivers/char/random.c  | 14 ++++++++++++--
 include/linux/sysctl.h |  1 -
 kernel/sysctl.c        |  5 -----
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index a7cf6aa65908..73fd4b6e9c18 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2101,8 +2101,7 @@ static int proc_do_entropy(struct ctl_table *table, int write,
 }
 
 static int sysctl_poolsize = INPUT_POOL_WORDS * 32;
-extern struct ctl_table random_table[];
-struct ctl_table random_table[] = {
+static struct ctl_table random_table[] = {
 	{
 		.procname	= "poolsize",
 		.data		= &sysctl_poolsize,
@@ -2164,6 +2163,17 @@ struct ctl_table random_table[] = {
 #endif
 	{ }
 };
+
+/*
+ * rand_initialize() is called before sysctl_init(),
+ * so we cannot call register_sysctl_init() in rand_initialize()
+ */
+static int __init random_sysctls_init(void)
+{
+	register_sysctl_subdir("kernel", "random", random_table);
+	return 0;
+}
+device_initcall(random_sysctls_init);
 #endif 	/* CONFIG_SYSCTL */
 
 struct batched_entropy {
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index e5364b69dd95..33a471b56345 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -216,7 +216,6 @@ extern int unaligned_dump_stack;
 extern int no_unaligned_warning;
 
 extern struct ctl_table sysctl_mount_point[];
-extern struct ctl_table random_table[];
 
 #else /* CONFIG_SYSCTL */
 static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5c116904feb7..f9a35325d5d5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2078,11 +2078,6 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= sysctl_max_threads,
 	},
-	{
-		.procname	= "random",
-		.mode		= 0555,
-		.child		= random_table,
-	},
 	{
 		.procname	= "usermodehelper",
 		.mode		= 0555,
-- 
2.26.2