linux-kernel - Re: [PATCH v5 07/13] perf/x86/amd: make Zen3 branch sampling opt-in

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Date:   Thu, 27 Jan 2022 13:51:45 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kim.phillips@....com,
        acme@...hat.com, jolsa@...hat.com, songliubraving@...com
Subject: Re: [PATCH v5 07/13] perf/x86/amd: make Zen3 branch sampling opt-in

On Wed, Jan 26, 2022 at 03:34:48PM -0800, Stephane Eranian wrote:
> This patch adds a kernel config option to make support
> for AMD Zen3 Branch Sampling (BRS) an opt-in compile
> time option.
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
>  arch/x86/events/Kconfig      |  8 ++++++
>  arch/x86/events/amd/Makefile |  3 ++-
>  arch/x86/events/perf_event.h | 49 ++++++++++++++++++++++++++++--------
>  3 files changed, 49 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/events/Kconfig b/arch/x86/events/Kconfig
> index d6cdfe631674..1dc002ef66da 100644
> --- a/arch/x86/events/Kconfig
> +++ b/arch/x86/events/Kconfig
> @@ -44,4 +44,12 @@ config PERF_EVENTS_AMD_UNCORE
>  
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called 'amd-uncore'.
> +
> +config PERF_EVENTS_AMD_BRS
> +	depends on PERF_EVENTS && CPU_SUP_AMD
> +	tristate "AMD Zen3 Branch Sampling support"

tristate ?!