printk_ratelimit() functions should use CONFIG_PRINTK

Makes an embedded image a bit smaller.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/kernel.h

@@ -180,6 +180,13 @@ 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)));
@@ -190,6 +197,12 @@ 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
 
 extern void __attribute__((format(printf, 1, 2)))
@@ -197,11 +210,6 @@ extern void __attribute__((format(printf, 1, 2)))
 
 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;

kernel/printk.c

@@ -1251,6 +1251,7 @@ void tty_write_message(struct tty_struct *tty, char *msg)
 	return;
 }
 
+#if defined CONFIG_PRINTK
 /*
  * printk rate limiting, lifted from the networking subsystem.
  *
@@ -1320,3 +1321,4 @@ bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 	return false;
 }
 EXPORT_SYMBOL(printk_timed_ratelimit);
+#endif

kernel/sysctl.c

@@ -73,8 +73,6 @@ 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;
@@ -490,14 +488,6 @@ 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,
@@ -644,6 +634,15 @@ 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",
@@ -661,6 +660,7 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
+#endif
 	{
 		.ctl_name	= KERN_NGROUPS_MAX,
 		.procname	= "ngroups_max",