X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fprintk.c;h=66426552fbfef24e49442ed08f8d595930feca32;hb=a44b56d354b49f9abb184e5a14f71889856283bb;hp=bdba5d80496c98c9ccfe41a4372cd944d5b334a1;hpb=cf57a308436653f3094590202c77459aab250ff3;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/printk.c b/kernel/printk.c
index bdba5d80496..66426552fbf 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>
 
@@ -52,7 +53,7 @@ int console_printk[4] = {
 	DEFAULT_CONSOLE_LOGLEVEL,	/* default_console_loglevel */
 };
 
-EXPORT_SYMBOL(console_printk);
+EXPORT_UNUSED_SYMBOL(console_printk);  /*  June 2006  */
 
 /*
  * Low lever drivers may need that to know if they can schedule in
@@ -721,6 +722,7 @@ int __init add_preferred_console(char *name, int idx, char *options)
 	return 0;
 }
 
+#ifndef CONFIG_DISABLE_CONSOLE_SUSPEND
 /**
  * suspend_console - suspend the console subsystem
  *
@@ -728,6 +730,7 @@ int __init add_preferred_console(char *name, int idx, char *options)
  */
 void suspend_console(void)
 {
+	printk("Suspending console(s)\n");
 	acquire_console_sem();
 	console_suspended = 1;
 }
@@ -737,6 +740,7 @@ void resume_console(void)
 	console_suspended = 0;
 	release_console_sem();
 }
+#endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */
 
 /**
  * acquire_console_sem - lock the console system for exclusive use.
@@ -773,7 +777,7 @@ int is_console_locked(void)
 {
 	return console_locked;
 }
-EXPORT_SYMBOL(is_console_locked);
+EXPORT_UNUSED_SYMBOL(is_console_locked);  /*  June 2006  */
 
 /**
  * release_console_sem - unlock the console system
@@ -799,6 +803,9 @@ void release_console_sem(void)
 		up(&secondary_console_sem);
 		return;
 	}
+
+	console_may_schedule = 0;
+
 	for ( ; ; ) {
 		spin_lock_irqsave(&logbuf_lock, flags);
 		wake_klogd |= log_start - log_end;
@@ -812,18 +819,10 @@ void release_console_sem(void)
 		local_irq_restore(flags);
 	}
 	console_locked = 0;
-	console_may_schedule = 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);
 
@@ -1103,3 +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);