2 files changed, 23 insertions, 0 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 80f39cab470a..24b611147adb 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -171,6 +171,8 @@ __attribute_const__ roundup_pow_of_two(unsigned long x)
 
 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)
 {
diff --git a/kernel/printk.c b/kernel/printk.c
index f7d427ef5038..66426552fbfe 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -31,6 +31,7 @@
 #include <linux/security.h>
 #include <linux/bootmem.h>
 #include <linux/syscalls.h>
+#include <linux/jiffies.h>
 
 #include <asm/uaccess.h>
 
@@ -1101,3 +1102,23 @@ int printk_ratelimit(void)
                                 printk_ratelimit_burst);
 }
 EXPORT_SYMBOL(printk_ratelimit);
+
+/**
+ * printk_timed_ratelimit - caller-controlled printk ratelimiting
+ * @caller_jiffies: pointer to caller's state
+ * @interval_msecs: minimum interval between prints
+ *
+ * printk_timed_ratelimit() returns true if more than @interval_msecs
+ * milliseconds have elapsed since the last time printk_timed_ratelimit()
+ * returned true.
+ */
+bool printk_timed_ratelimit(unsigned long *caller_jiffies,
+                        unsigned int interval_msecs)
+{
+        if (*caller_jiffies == 0 || time_after(jiffies, *caller_jiffies)) {
+                *caller_jiffies = jiffies + msecs_to_jiffies(interval_msecs);
+                return true;
+        }
+        return false;
+}
+EXPORT_SYMBOL(printk_timed_ratelimit);