[PATCH v2 7/7] xen/arm: set the system time in Xen via the XENPF_settime64 hypercall

Arnd Bergmann
2015-11-10T12:39:44Z

On Tuesday 10 November 2015 11:57:55 Stefano Stabellini wrote:
> + op.u.settime64.nsecs = now.tv_nsec;
> + op.u.settime64.system_time = arch_timer_read_counter() * (u64)NSEC_PER_SEC;
> + do_div(op.u.settime64.system_time, arch_timer_get_rate());

NSEC_PER_SEC is a large number, doesn't that multiplication overflow the
64-bit system_time variable?

> + printk("GTOD: Setting to %llu.%u at %llu\n",

%llu.%09u

so you get the leading zeroes.

> + op.u.settime64.secs,
> + op.u.settime64.nsecs,
> + op.u.settime64.system_time);
> + (void)HYPERVISOR_platform_op(&op);

Arnd