From: Jiri Slaby Date: Tue, 2 Mar 2021 06:21:41 +0000 (+0100) Subject: tty: 8250, use ms_to_ktime X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=60294d86f27c9d075ca9b700b7786cef706546b5;p=linux.git tty: 8250, use ms_to_ktime This really eliminates multiplications from the assembly. I would have thought they are optimized by inlining ktime_set, but not on x86_64 with gcc 10. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20210302062214.29627-11-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index b0af13074cd36..167c1e3e53bc3 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1487,11 +1487,7 @@ static enum hrtimer_restart serial8250_em485_handle_stop_tx(struct hrtimer *t) static void start_hrtimer_ms(struct hrtimer *hrt, unsigned long msec) { - long sec = msec / 1000; - long nsec = (msec % 1000) * 1000000; - ktime_t t = ktime_set(sec, nsec); - - hrtimer_start(hrt, t, HRTIMER_MODE_REL); + hrtimer_start(hrt, ms_to_ktime(msec), HRTIMER_MODE_REL); } static void __stop_tx_rs485(struct uart_8250_port *p)