vt: ioctl, switch VT_IS_IN_USE and VT_BUSY to inlines

BugLink: https://bugs.launchpad.net/bugs/1873852

commit e587e8f1 upstream.

These two were macros. Switch them to static inlines, so that it's more
understandable what they are doing.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200219073951.16151-2-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

drivers/tty/vt/vt_ioctl.c

@@ -39,10 +39,25 @@
 #include <linux/selection.h>
 
 char vt_dont_switch;
-extern struct tty_driver *console_driver;
 
-#define VT_IS_IN_USE(i)	(console_driver->ttys[i] && console_driver->ttys[i]->count)
-#define VT_BUSY(i)	(VT_IS_IN_USE(i) || i == fg_console || vc_is_sel(vc_cons[i].d))
+static inline bool vt_in_use(unsigned int i)
+{
+	extern struct tty_driver *console_driver;
+
+	return console_driver->ttys[i] && console_driver->ttys[i]->count;
+}
+
+static inline bool vt_busy(int i)
+{
+	if (vt_in_use(i))
+		return true;
+	if (i == fg_console)
+		return true;
+	if (vc_is_sel(vc_cons[i].d))
+		return true;
+
+	return false;
+}
 
 /*
  * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
@@ -292,7 +307,7 @@ static int vt_disallocate(unsigned int vc_num)
 	int ret = 0;
 
 	console_lock();
-	if (VT_BUSY(vc_num))
+	if (vt_busy(vc_num))
 		ret = -EBUSY;
 	else if (vc_num)
 		vc = vc_deallocate(vc_num);
@@ -314,7 +329,7 @@ static void vt_disallocate_all(void)
 
 	console_lock();
 	for (i = 1; i < MAX_NR_CONSOLES; i++)
-		if (!VT_BUSY(i))
+		if (!vt_busy(i))
 			vc[i] = vc_deallocate(i);
 		else
 			vc[i] = NULL;
@@ -651,7 +666,7 @@ int vt_ioctl(struct tty_struct *tty,
 			state = 1;	/* /dev/tty0 is always open */
 			for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
 							++i, mask <<= 1)
-				if (VT_IS_IN_USE(i))
+				if (vt_in_use(i))
 					state |= mask;
 			ret = put_user(state, &vtstat->v_state);
 		}
@@ -664,7 +679,7 @@ int vt_ioctl(struct tty_struct *tty,
 	case VT_OPENQRY:
 		/* FIXME: locking ? - but then this is a stupid API */
 		for (i = 0; i < MAX_NR_CONSOLES; ++i)
-			if (! VT_IS_IN_USE(i))
+			if (!vt_in_use(i))
 				break;
 		uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
 		goto setint;