1 files changed, 53 insertions, 14 deletions

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 0c80c68cd047..bd1d1164fec5 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -161,6 +161,11 @@ static void set_palette(struct vc_data *vc);
 static int printable;           /* Is console ready for printing? */
 int default_utf8 = true;
 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
+int global_cursor_default = -1;
+module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
+
+static int cur_default = CUR_DEFAULT;
+module_param(cur_default, int, S_IRUGO | S_IWUSR);
 
 /*
  * ignore_poke: don't unblank the screen when things are typed.  This is
@@ -182,12 +187,10 @@ static DECLARE_WORK(console_work, console_callback);
  * fg_console is the current virtual console,
  * last_console is the last used one,
  * want_console is the console we want to switch to,
- * kmsg_redirect is the console for kernel messages,
  */
 int fg_console;
 int last_console;
 int want_console = -1;
-int kmsg_redirect;
 
 /*
  * For each existing display, we have a pointer to console currently visible
@@ -775,6 +778,12 @@ int vc_allocate(unsigned int currcons)	/* return 0 on success */
                 vc_cons[currcons].d = NULL;
                 return -ENOMEM;
             }
+
+            /* If no drivers have overridden us and the user didn't pass a
+               boot option, default to displaying the cursor */
+            if (global_cursor_default == -1)
+                    global_cursor_default = 1;
+
             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
             vcs_make_sysfs(currcons);
             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
@@ -812,7 +821,7 @@ static inline int resize_screen(struct vc_data *vc, int width, int height,
  *
  *      Resize a virtual console, clipping according to the actual constraints.
  *      If the caller passes a tty structure then update the termios winsize
- *      information and perform any neccessary signal handling.
+ *      information and perform any necessary signal handling.
  *
  *      Caller must hold the console semaphore. Takes the termios mutex and
  *      ctrl_lock of the tty IFF a tty is passed.
@@ -1616,7 +1625,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
         vc->vc_decscnm          = 0;
         vc->vc_decom            = 0;
         vc->vc_decawm           = 1;
-        vc->vc_deccm            = 1;
+        vc->vc_deccm            = global_cursor_default;
         vc->vc_decim            = 0;
 
         set_kbd(vc, decarm);
@@ -1630,7 +1639,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
         /* do not do set_leds here because this causes an endless tasklet loop
            when the keyboard hasn't been initialized yet */
 
-        vc->vc_cursor_type = CUR_DEFAULT;
+        vc->vc_cursor_type = cur_default;
         vc->vc_complement_mask = vc->vc_s_complement_mask;
 
         default_attr(vc);
@@ -1832,7 +1841,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
                                 if (vc->vc_par[0])
                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
                                 else
-                                        vc->vc_cursor_type = CUR_DEFAULT;
+                                        vc->vc_cursor_type = cur_default;
                                 return;
                         }
                         break;
@@ -2110,8 +2119,6 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
         uint8_t inverse;
         uint8_t width;
         u16 himask, charmask;
-        const unsigned char *orig_buf = NULL;
-        int orig_count;
 
         if (in_interrupt())
                 return count;
@@ -2133,8 +2140,6 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
             release_console_sem();
             return 0;
         }
-        orig_buf = buf;
-        orig_count = count;
 
         himask = vc->vc_hi_font_mask;
         charmask = himask ? 0x1ff : 0xff;
@@ -2426,6 +2431,37 @@ struct tty_driver *console_driver;
 
 #ifdef CONFIG_VT_CONSOLE
 
+/**
+ * vt_kmsg_redirect() - Sets/gets the kernel message console
+ * @new:        The new virtual terminal number or -1 if the console should stay
+ *              unchanged
+ *
+ * By default, the kernel messages are always printed on the current virtual
+ * console. However, the user may modify that default with the
+ * TIOCL_SETKMSGREDIRECT ioctl call.
+ *
+ * This function sets the kernel message console to be @new. It returns the old
+ * virtual console number. The virtual terminal number 0 (both as parameter and
+ * return value) means no redirection (i.e. always printed on the currently
+ * active console).
+ *
+ * The parameter -1 means that only the current console is returned, but the
+ * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
+ * case to make the code more understandable.
+ *
+ * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
+ * the parameter and always returns 0.
+ */
+int vt_kmsg_redirect(int new)
+{
+        static int kmsg_con;
+
+        if (new != -1)
+                return xchg(&kmsg_con, new);
+        else
+                return kmsg_con;
+}
+
 /*
  *      Console on virtual terminal
  *
@@ -2440,6 +2476,7 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
         const ushort *start;
         ushort cnt = 0;
         ushort myx;
+        int kmsg_console;
 
         /* console busy or not yet initialized */
         if (!printable)
@@ -2447,8 +2484,9 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
         if (!spin_trylock(&printing_lock))
                 return;
 
-        if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
-                vc = vc_cons[kmsg_redirect - 1].d;
+        kmsg_console = vt_get_kmsg_redirect();
+        if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
+                vc = vc_cons[kmsg_console - 1].d;
 
         /* read `x' only after setting currcons properly (otherwise
            the `x' macro will read the x of the foreground console). */
@@ -2605,7 +2643,7 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
                         ret = set_vesa_blanking(p);
                         break;
                 case TIOCL_GETKMSGREDIRECT:
-                        data = kmsg_redirect;
+                        data = vt_get_kmsg_redirect();
                         ret = __put_user(data, p);
                         break;
                 case TIOCL_SETKMSGREDIRECT:
@@ -2615,7 +2653,7 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
                                 if (get_user(data, p+1))
                                         ret = -EFAULT;
                                 else
-                                        kmsg_redirect = data;
+                                        vt_kmsg_redirect(data);
                         }
                         break;
                 case TIOCL_GETFGCONSOLE:
@@ -4078,6 +4116,7 @@ EXPORT_SYMBOL(fg_console);
 EXPORT_SYMBOL(console_blank_hook);
 EXPORT_SYMBOL(console_blanked);
 EXPORT_SYMBOL(vc_cons);
+EXPORT_SYMBOL(global_cursor_default);
 #ifndef VT_SINGLE_DRIVER
 EXPORT_SYMBOL(take_over_console);
 EXPORT_SYMBOL(give_up_console);