Re: [PATCH v7 00/13] perf/x86/amd: Add AMD Fam19h Branch Sampling support

[Peter Zijlstra]

On Tue, Mar 29, 2022 at 04:47:52PM -0700, Stephane Eranian wrote:
> False alarm. I had not forced the config option. With the config
> option enabled, it works as expected.

Great!

> I just found a minor issue in case BRS is not enabled. To be
> consistent, we should do:
> 
> --- a/arch/x86/events/perf_event.h
> +++ b/arch/x86/events/perf_event.h
> @@ -1265,7 +1265,7 @@ static inline s64 amd_brs_adjust_period(s64 period)
>  #else
>  static inline int amd_brs_init(void)
>  {
> -       return 0;
> +       return -EOPNOTSUPP;
>  }

Done!