1 files changed, 23 insertions, 9 deletions

diff --git a/kernel/printk.c b/kernel/printk.c
index 771f5e861bcd..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>
 
@@ -820,15 +821,8 @@ void release_console_sem(void)
         console_locked = 0;
         up(&console_sem);
         spin_unlock_irqrestore(&logbuf_lock, flags);
-        if (wake_klogd && !oops_in_progress && waitqueue_active(&log_wait)) {
-                /*
-                 * If we printk from within the lock dependency code,
-                 * from within the scheduler code, then do not lock
-                 * up due to self-recursion:
-                 */
-                if (!lockdep_internal())
-                        wake_up_interruptible(&log_wait);
-        }
+        if (wake_klogd && !oops_in_progress && waitqueue_active(&log_wait))
+                wake_up_interruptible(&log_wait);
 }
 EXPORT_SYMBOL(release_console_sem);
 
@@ -1108,3 +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);