tty: localise ptychar and make it const

ptychar was not const, so mark it as such. And move this variable to the
only place where it's used.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210302062214.29627-36-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c8cbf08..7cf57e6 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1196,8 +1196,6 @@ int tty_send_xchar(struct tty_struct *tty, char ch)
        return 0;
 }
 
-static char ptychar[] = "pqrstuvwxyzabcde";
-
 /**
  *     pty_line_name   -       generate name for a pty
  *     @driver: the tty driver in use
@@ -1211,6 +1209,7 @@ static char ptychar[] = "pqrstuvwxyzabcde";
  */
 static void pty_line_name(struct tty_driver *driver, int index, char *p)
 {
+       static const char ptychar[] = "pqrstuvwxyzabcde";
        int i = index + driver->name_base;
        /* ->name is initialized to "ttyp", but "tty" is expected */
        sprintf(p, "%s%c%x",