[PATCH V7 01/18] perf/core: Use static_call to optimize perf_guest_info_callbacks

[Boris Ostrovsky]

On 6/22/21 5:38 AM, Zhu Lingshan wrote:

> -static int xen_is_user_mode(void)
> -{
> -	const struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
> +	state |= PERF_GUEST_ACTIVE;
>  
> -	if (!xenpmu_data) {
> -		pr_warn_once("%s: pmudata not initialized\n", __func__);
> -		return 0;
> +	if (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_PV) {
> +		if (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_USER)
> +			state |= PERF_GUEST_USER;
> +	} else {
> +		if (!!(xenpmu_data->pmu.r.regs.cpl & 3))
> +			state |= PERF_GUEST_USER;



Please drop "!!", it's not needed here. And use "else if".


With that, for Xen bits:

Reviewed-by: Boris Ostrovsky <boris.ostrvsky at oracle.com>

-boris