[PATCH] printk_ratelimit functions should use CONFIG_PRINTK

[Joe Perches <joe@perches.com>]

Makes an embedded image a bit smaller

Signed-off-by: Joe Perches <joe@perches.com>
---
 include/linux/kernel.h |   20 +++++++++++++++-----
 kernel/printk.c        |    2 ++
 kernel/sysctl.c        |   20 ++++++++++----------
 3 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 94bc996..db2d5e7 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -182,6 +182,13 @@ asmlinkage int printk(const char * fmt, ...)
 extern int log_buf_get_len(void);
 extern int log_buf_read(int idx);
 extern int log_buf_copy(char *dest, int idx, int len);
+
+extern int printk_ratelimit_jiffies;
+extern int printk_ratelimit_burst;
+extern int printk_ratelimit(void);
+extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
+extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
+				   unsigned int interval_msec);
 #else
 static inline int vprintk(const char *s, va_list args)
 	__attribute__ ((format (printf, 1, 0)));
@@ -192,15 +199,18 @@ static inline int __cold printk(const char *s, ...) { return 0; }
 static inline int log_buf_get_len(void) { return 0; }
 static inline int log_buf_read(int idx) { return 0; }
 static inline int log_buf_copy(char *dest, int idx, int len) { return 0; }
+
+static inline int printk_ratelimit(void) { return 0; }
+static inline int __printk_ratelimit(int ratelimit_jiffies, \
+				     int ratelimit_burst) { return 0; }
+static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
+					  unsigned int interval_msec)	\
+		{ return false; }
+
 #endif
 
 unsigned long int_sqrt(unsigned long);
 
-extern int printk_ratelimit(void);
-extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
-extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
-				unsigned int interval_msec);
-
 static inline void console_silent(void)
 {
 	console_loglevel = 0;
diff --git a/kernel/printk.c b/kernel/printk.c
index a30fe33..2259540 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1235,6 +1235,7 @@ void tty_write_message(struct tty_struct *tty, char *msg)
 	return;
 }
 
+#if defined CONFIG_PRINTK
 /*
  * printk rate limiting, lifted from the networking subsystem.
  *
@@ -1304,3 +1305,4 @@ bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 	return false;
 }
 EXPORT_SYMBOL(printk_timed_ratelimit);
+#endif
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8ac5171..f60b9e4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -72,8 +72,6 @@ extern int suid_dumpable;
 extern char core_pattern[];
 extern int pid_max;
 extern int min_free_kbytes;
-extern int printk_ratelimit_jiffies;
-extern int printk_ratelimit_burst;
 extern int pid_max_min, pid_max_max;
 extern int sysctl_drop_caches;
 extern int percpu_pagelist_fraction;
@@ -462,14 +460,6 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
-	{
-		.ctl_name	= KERN_PRINTK,
-		.procname	= "printk",
-		.data		= &console_loglevel,
-		.maxlen		= 4*sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= &proc_dointvec,
-	},
 #ifdef CONFIG_KMOD
 	{
 		.ctl_name	= KERN_MODPROBE,
@@ -616,6 +606,15 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
+#if defined CONFIG_PRINTK
+	{
+		.ctl_name	= KERN_PRINTK,
+		.procname	= "printk",
+		.data		= &console_loglevel,
+		.maxlen		= 4*sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
 	{
 		.ctl_name	= KERN_PRINTK_RATELIMIT,
 		.procname	= "printk_ratelimit",
@@ -633,6 +632,7 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
+#endif
 	{
 		.ctl_name	= KERN_NGROUPS_MAX,
 		.procname	= "ngroups_max",