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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 <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210302062214.29627-11-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-03-02 07:21:41 +01:00 committed by Greg Kroah-Hartman
parent f751ae1cbb
commit 60294d86f2
1 changed files with 1 additions and 5 deletions
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6
drivers/tty/serial/8250/8250_port.c
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@ -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)