diff options
Diffstat (limited to 'include/linux/console.h')
| -rw-r--r-- | include/linux/console.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/console.h b/include/linux/console.h index 9a251e70c090..143653090c48 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -16,6 +16,7 @@ #include <linux/atomic.h> #include <linux/types.h> +#include <linux/mutex.h> struct vc_data; struct console_font_op; @@ -154,6 +155,20 @@ struct console { u64 seq; unsigned long dropped; struct task_struct *thread; + bool blocked; + + /* + * The per-console lock is used by printing kthreads to synchronize + * this console with callers of console_lock(). This is necessary in + * order to allow printing kthreads to run in parallel to each other, + * while each safely accessing the @blocked field and synchronizing + * against direct printing via console_lock/console_unlock. + * + * Note: For synchronizing against direct printing via + * console_trylock/console_unlock, see the static global + * variable @console_kthreads_active. + */ + struct mutex lock; void *data; struct console *next; |