X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fprintk.c;h=a30fe33de395a7964f68e237c73de7344190b18a;hb=41a2d6cfa3f77ec469e7e5f06b4d7ffd031f9c0e;hp=b2b5c3a22a36b302da177fafae653740f7eeeddf;hpb=ebc283118ee448dcb6e6cae74a8a43f17a1ccc3f;p=linux-2.6

diff --git a/kernel/printk.c b/kernel/printk.c
index b2b5c3a22a..a30fe33de3 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -219,6 +219,58 @@ static inline void boot_delay_msec(void)
 }
 #endif
 
+/*
+ * Return the number of unread characters in the log buffer.
+ */
+int log_buf_get_len(void)
+{
+	return logged_chars;
+}
+
+/*
+ * Copy a range of characters from the log buffer.
+ */
+int log_buf_copy(char *dest, int idx, int len)
+{
+	int ret, max;
+	bool took_lock = false;
+
+	if (!oops_in_progress) {
+		spin_lock_irq(&logbuf_lock);
+		took_lock = true;
+	}
+
+	max = log_buf_get_len();
+	if (idx < 0 || idx >= max) {
+		ret = -1;
+	} else {
+		if (len > max)
+			len = max;
+		ret = len;
+		idx += (log_end - max);
+		while (len-- > 0)
+			dest[len] = LOG_BUF(idx + len);
+	}
+
+	if (took_lock)
+		spin_unlock_irq(&logbuf_lock);
+
+	return ret;
+}
+
+/*
+ * Extract a single character from the log buffer.
+ */
+int log_buf_read(int idx)
+{
+	char ret;
+
+	if (log_buf_copy(&ret, idx, 1) == 1)
+		return ret;
+	else
+		return -1;
+}
+
 /*
  * Commands to do_syslog:
  *
@@ -810,7 +862,16 @@ int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, cha
 	return -1;
 }
 
-#ifndef CONFIG_DISABLE_CONSOLE_SUSPEND
+int console_suspend_enabled = 1;
+EXPORT_SYMBOL(console_suspend_enabled);
+
+static int __init console_suspend_disable(char *str)
+{
+	console_suspend_enabled = 0;
+	return 1;
+}
+__setup("no_console_suspend", console_suspend_disable);
+
 /**
  * suspend_console - suspend the console subsystem
  *
@@ -818,6 +879,8 @@ int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, cha
  */
 void suspend_console(void)
 {
+	if (!console_suspend_enabled)
+		return;
 	printk("Suspending console(s)\n");
 	acquire_console_sem();
 	console_suspended = 1;
@@ -825,10 +888,11 @@ void suspend_console(void)
 
 void resume_console(void)
 {
+	if (!console_suspend_enabled)
+		return;
 	console_suspended = 0;
 	release_console_sem();
 }
-#endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */
 
 /**
  * acquire_console_sem - lock the console system for exclusive use.