On 15/06/16 11:27, Jan Beulich wrote:
> Matching Linux commit 03b9730b76 ("x86/asm/tsc: Add rdtsc_ordered() and
> use it in trivial call sites") and earlier ones it builds upon, let's
> make sure timing loops don't have their rdtsc()-s re-ordered, as that
> would harm precision of the result (values were observed to be several
> hundred clocks off without this adjustment).
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>