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Subject: Re: [PATCH 04/10] perf, x86: Making hardware events translations
 available in sysfs
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jiri Olsa <jolsa@redhat.com>
Cc: acme@redhat.com, mingo@elte.hu, paulus@samba.org,
        cjashfor@linux.vnet.ibm.com, fweisbec@gmail.com, eranian@google.com,
        linux-kernel@vger.kernel.org
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Date: Wed, 04 Jul 2012 12:24:54 +0200
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On Wed, 2012-07-04 at 00:00 +0200, Jiri Olsa wrote:
> +static struct attribute *events_attr[] = {
> +       &event_attr_cycles.attr,
> +       &event_attr_instructions.attr,
> +       &event_attr_cache_references.attr,
> +       &event_attr_cache_misses.attr,
> +       &event_attr_branch_instructions.attr,
> +       &event_attr_branch_misses.attr,
> +       &event_attr_bus_cycles.attr,
> +       &event_attr_stalled_cycles_frontend.attr,
> +       &event_attr_stalled_cycles_backend.attr,
> +       &event_attr_ref_cycles.attr,
> +       NULL,
> +}; 

Hmm, should we do:

  if (!config)
    return -EINVAL;

or somesuch to clearly indicate an event isn't supported?

Its currently a bit of a mixed bag between 0 and -1.. we might want to
clean that up too.