Re: [PATCH 21/21] perf/x86/intel/lbr: Support XSAVES for arch LBR read

[Cyrill Gorcunov]

On Fri, Jun 19, 2020 at 07:04:09AM -0700, kan.liang@xxxxxxxxxxxxxxx wrote:
...
> +static void intel_pmu_arch_lbr_read_xsave(struct cpu_hw_events *cpuc)
> +{
> +	struct x86_perf_task_context_arch_lbr_xsave *xsave = cpuc->lbr_xsave;
> +	struct arch_lbr_entry *lbr;
> +	int i;
> +
> +	if (!xsave)
> +		goto rollback;

Why not make it simplier?

	if (!xsave) {
		intel_pmu_arch_lbr_read(cpuc);
		return;
	}

The goto and "return" statement before the "rollback" label
looks pretty ugly. I'm sorry I didn't follow the series
in details so if you plan to add more handlers at "rollback"
then sure.