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

[Zhu, Lingshan]

Thanks Boris, I will fix this in V8

On 6/23/2021 1:31 AM, Boris Ostrovsky wrote:
>
> 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
>