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Date: Mon, 15 Jun 2020 09:48:40 +0200 From: Jiri Slaby <jslaby@...e.cz> To: gregkh@...uxfoundation.org Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz> Subject: [PATCH 08/38] vt: use tty_insert_flip_string in respond_string Pass the length of a string to respond_string and use tty_insert_flip_string instead of a loop with tty_insert_flip_char. This simplifies the processing on the tty side. The added strlens are optimized during constant folding and propagation and the result are proper constants in assembly. Signed-off-by: Jiri Slaby <jslaby@...e.cz> --- drivers/tty/vt/vt.c | 27 +++++++++++++++------------ 1 file changed, 15 insertions(+), 12 deletions(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 3adb7f409524..49c9d1e4067c 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1809,40 +1809,43 @@ static void csi_m(struct vc_data *vc) update_attr(vc); } -static void respond_string(const char *p, struct tty_port *port) +static void respond_string(const char *p, size_t len, struct tty_port *port) { - while (*p) { - tty_insert_flip_char(port, *p, 0); - p++; - } + tty_insert_flip_string(port, p, len); tty_schedule_flip(port); } static void cursor_report(struct vc_data *vc, struct tty_struct *tty) { char buf[40]; + int len; - sprintf(buf, "\033[%d;%dR", vc->state.y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->state.x + 1); - respond_string(buf, tty->port); + len = sprintf(buf, "\033[%d;%dR", vc->state.y + + (vc->vc_decom ? vc->vc_top + 1 : 1), + vc->state.x + 1); + respond_string(buf, len, tty->port); } static inline void status_report(struct tty_struct *tty) { - respond_string("\033[0n", tty->port); /* Terminal ok */ + static const char teminal_ok[] = "\033[0n"; + + respond_string(teminal_ok, strlen(teminal_ok), tty->port); } static inline void respond_ID(struct tty_struct *tty) { - respond_string(VT102ID, tty->port); + respond_string(VT102ID, strlen(VT102ID), tty->port); } void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry) { char buf[8]; + int len; - sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx), - (char)('!' + mry)); - respond_string(buf, tty->port); + len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), + (char)('!' + mrx), (char)('!' + mry)); + respond_string(buf, len, tty->port); } /* invoked via ioctl(TIOCLINUX) and through set_selection_user */ -- 2.27.0
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