On Mon, 27 Aug 2018, Peter Zijlstra wrote:

> Something like so then?
> 
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index eeb787b1c53c..f35eb72739c0 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -144,7 +144,7 @@ enum perf_event_sample_format {
>  
>       PERF_SAMPLE_MAX = 1U << 20,             /* non-ABI */
>  
> -     __PERF_SAMPLE_CALLCHAIN_EARLY           = 1ULL << 63,
> +     __PERF_SAMPLE_CALLCHAIN_EARLY           = 1ULL << 63, /* non-ABI; 
> internal use */
>  };

yes, something like that would be fine.

I am being difficult about this, but from experience when trying to keep 
the manpage updated, what seems obvious now will not be so obvious 6 
months from now and trying to dig through the git logs / mailing list 
archives to verify the purpose of an addition can be a lot of work 
sometimes.

Vince

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