1 files changed, 14 insertions, 5 deletions

diff --git a/include/linux/console.h b/include/linux/console.h
index dfd6b0e97855..ec9bdb3d7bab 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -14,6 +14,7 @@
 #ifndef _LINUX_CONSOLE_H_
 #define _LINUX_CONSOLE_H_ 1
 
+#include <linux/atomic.h>
 #include <linux/types.h>
 
 struct vc_data;
@@ -21,6 +22,7 @@ struct console_font_op;
 struct console_font;
 struct module;
 struct tty_struct;
+struct notifier_block;
 
 /*
  * this is what the terminal answers to a ESC-Z or csi0c query.
@@ -200,11 +202,14 @@ void vcs_make_sysfs(int index);
 void vcs_remove_sysfs(int index);
 
 /* Some debug stub to catch some of the obvious races in the VT code */
-#if 1
-#define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
-#else
-#define WARN_CONSOLE_UNLOCKED()
-#endif
+#define WARN_CONSOLE_UNLOCKED()                                         \
+        WARN_ON(!atomic_read(&ignore_console_lock_warning) &&           \
+                !is_console_locked() && !oops_in_progress)
+/*
+ * Increment ignore_console_lock_warning if you need to quiet
+ * WARN_CONSOLE_UNLOCKED() for debugging purposes.
+ */
+extern atomic_t ignore_console_lock_warning;
 
 /* VESA Blanking Levels */
 #define VESA_NO_BLANKING        0
@@ -220,4 +225,8 @@ static inline bool vgacon_text_force(void) { return false; }
 
 extern void console_init(void);
 
+/* For deferred console takeover */
+void dummycon_register_output_notifier(struct notifier_block *nb);
+void dummycon_unregister_output_notifier(struct notifier_block *nb);
+
 #endif /* _LINUX_CONSOLE_H */