Compile time error "invalid operands to binary / "

[lefamz]

During make on Raspberry Pi 3, kernel 4.9.35-v7+, gcc (Raspbian 4.9.2-10+deb8u2) 4.9.2, I've encountered following error:
make -C /usr/src/linux-headers-4.9.35-v7+ M=/home/pi/soft_uart modules make[1]: Entering directory '/usr/src/linux-headers-4.9.35-v7+' CC [M] /home/pi/soft_uart/raspberry_soft_uart.o /home/pi/soft_uart/raspberry_soft_uart.c: In function ‘handle_rx_start’: /home/pi/soft_uart/raspberry_soft_uart.c:185:50: error: invalid operands to binary / (have ‘ktime_t’ and ‘int’) hrtimer_start(&timer_rx, ktime_set(0, period / 2), HRTIMER_MODE_REL); ^ scripts/Makefile.build:293: recipe for target '/home/pi/soft_uart/raspberry_soft_uart.o' failed

Issue is caused by line 185:
hrtimer_start(&timer_rx, ktime_set(0, period / 2), HRTIMER_MODE_REL);

I've fixed this with ktime_to_ns function:
hrtimer_start(&timer_rx, ktime_set(0, ktime_to_ns(period) / 2), HRTIMER_MODE_REL);

Hope that helps if anyone faces the same issue.

[giampiero7]

Fixed in #13