On Mon, 7 Jan 2019, Marcelo Tosatti wrote:
>
> cpuid is causing register corruption: use mfence instead.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
>
> v2: fix signed-off-by line
>
> diff --git a/src/queuelat/queuelat.c b/src/queuelat/queuelat.c
> index 2230d04..3b291f1 100644
> --- a/src/queuelat/queuelat.c
> +++ b/src/queuelat/queuelat.c
> @@ -265,7 +265,7 @@ static inline unsigned long long __rdtscll(void)
> {
> DECLARE_ARGS(val, low, high);
>
> - asm volatile("cpuid; rdtsc" : EAX_EDX_RET(val, low, high));
> + asm volatile("mfence; rdtsc" : EAX_EDX_RET(val, low, high));
>
> return EAX_EDX_VAL(val, low, high);
> }
>
Signed-off-by: John Kacur <jkacur@xxxxxxxxxx>
