X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fprintk.c;h=6341af77eb65b559c1bf66e5cc7664b06779a694;hb=ec38fa2b35f13e7fa1d676a5bc997d0df1b02574;hp=a430fd04008b4b9565434ebefa0ee48a62dade90;hpb=95f9bfc6b76e862265a2d70ae061eec18fe14140;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/printk.c b/kernel/printk.c
index a430fd04008..6341af77eb6 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -13,7 +13,7 @@
  * Fixed SMP synchronization, 08/08/99, Manfred Spraul
  *     manfred@colorfullife.com
  * Rewrote bits to get rid of console_lock
- *	01Mar01 Andrew Morton <andrewm@uow.edu.au>
+ *	01Mar01 Andrew Morton
  */
 
 #include <linux/kernel.h>
@@ -577,9 +577,6 @@ static int have_callable_console(void)
  * @fmt: format string
  *
  * This is printk().  It can be called from any context.  We want it to work.
- * Be aware of the fact that if oops_in_progress is not set, we might try to
- * wake klogd up which could deadlock on runqueue lock if printk() is called
- * from scheduler code.
  *
  * We try to grab the console_sem.  If we succeed, it's easy - we log the output and
  * call the console drivers.  If we fail to get the semaphore we place the output
@@ -593,6 +590,8 @@ static int have_callable_console(void)
  *
  * See also:
  * printf(3)
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
  */
 
 asmlinkage int printk(const char *fmt, ...)
@@ -982,10 +981,25 @@ int is_console_locked(void)
 	return console_locked;
 }
 
-void wake_up_klogd(void)
+static DEFINE_PER_CPU(int, printk_pending);
+
+void printk_tick(void)
 {
-	if (!oops_in_progress && waitqueue_active(&log_wait))
+	if (__get_cpu_var(printk_pending)) {
+		__get_cpu_var(printk_pending) = 0;
 		wake_up_interruptible(&log_wait);
+	}
+}
+
+int printk_needs_cpu(int cpu)
+{
+	return per_cpu(printk_pending, cpu);
+}
+
+void wake_up_klogd(void)
+{
+	if (waitqueue_active(&log_wait))
+		__raw_get_cpu_var(printk_pending) = 1;
 }
 
 /**