console: Delete unused con_font_copy() callback implementations

Recently in commit 3c4e0dff2095 ("vt: Disable KD_FONT_OP_COPY") we
disabled the KD_FONT_OP_COPY ioctl() option. Delete all the
con_font_copy() callbacks, since we no longer use them.

Mark KD_FONT_OP_COPY as "obsolete" in include/uapi/linux/kd.h, just like
what we have done for PPPIOCDETACH in commit af8d3c7c001a ("ppp: remove
the PPPIOCDETACH ioctl").

Signed-off-by: Peilin Ye <[e-mail]>
Reviewed-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/c8d[e-mail]

drivers/usb/misc/sisusbvga/sisusb_con.c

···
 	return 0;
 }
 
-static int sisusbdummycon_font_copy(struct vc_data *vc, int con)
-{
-	return 0;
-}
-
 static const struct consw sisusb_dummy_con = {
 	.owner =		THIS_MODULE,
 	.con_startup =		sisusbdummycon_startup,
···
 	.con_blank =		sisusbdummycon_blank,
 	.con_font_set =		sisusbdummycon_font_set,
 	.con_font_default =	sisusbdummycon_font_default,
-	.con_font_copy =	sisusbdummycon_font_copy,
 };
 
 int

drivers/video/console/dummycon.c

···
 	return 0;
 }
 
-static int dummycon_font_copy(struct vc_data *vc, int con)
-{
-	return 0;
-}
-
 /*
  *  The console `switch' structure for the dummy console
  *
···
 	.con_blank =	dummycon_blank,
 	.con_font_set =	dummycon_font_set,
 	.con_font_default =	dummycon_font_default,
-	.con_font_copy =	dummycon_font_copy,
 };
 EXPORT_SYMBOL_GPL(dummy_con);

drivers/video/fbdev/core/fbcon.c

···
 	return 0;
 }
 
-static int fbcon_copy_font(struct vc_data *vc, int con)
-{
-	struct fbcon_display *od = &fb_display[con];
-	struct console_font *f = &vc->vc_font;
-
-	if (od->fontdata == f->data)
-		return 0;	/* already the same font... */
-	return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
-}
-
 /*
  *  User asked to set font; we are guaranteed that
  *	a) width and height are in range 1..32
···
 	.con_font_set 		= fbcon_set_font,
 	.con_font_get 		= fbcon_get_font,
 	.con_font_default	= fbcon_set_def_font,
-	.con_font_copy 		= fbcon_copy_font,
 	.con_set_palette 	= fbcon_set_palette,
 	.con_invert_region 	= fbcon_invert_region,
 	.con_screen_pos 	= fbcon_screen_pos,

include/linux/console.h

···
 	int	(*con_font_get)(struct vc_data *vc, struct console_font *font);
 	int	(*con_font_default)(struct vc_data *vc,
 			struct console_font *font, char *name);
-	int	(*con_font_copy)(struct vc_data *vc, int con);
 	int     (*con_resize)(struct vc_data *vc, unsigned int width,
 			unsigned int height, unsigned int user);
 	void	(*con_set_palette)(struct vc_data *vc,

include/uapi/linux/kd.h

···
 #define KD_FONT_OP_SET		0	/* Set font */
 #define KD_FONT_OP_GET		1	/* Get font */
 #define KD_FONT_OP_SET_DEFAULT	2	/* Set font to default, data points to name / NULL */
-#define KD_FONT_OP_COPY		3	/* Copy from another console */
+#define KD_FONT_OP_COPY		3	/* Obsolete, do not use */
 
 #define KD_FONT_FLAG_DONT_RECALC 	1	/* Don't recalculate hw charcell size [compat] */