linux-kernel - Re: [PATCH v1 1/5] perf/core: Define the common branch type classification

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Message-ID: <20170406092532.4zpuvqawrxjvadm6@hirez.programming.kicks-ass.net>
Date:   Thu, 6 Apr 2017 11:25:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v1 1/5] perf/core: Define the common branch type
 classification

On Thu, Apr 06, 2017 at 04:21:06PM +0800, Jin, Yao wrote:
> Hi, otherwise we have to maintain 2 branch type copies between kernel and
> user-space.
> 
> For example, currently X86_BR_* are defined in lbr.c. To display the branch
> type in user-space, the user-space has to maintain the same copy for
> X86_BR_*. I didn't get a better idea.

I still don't understand what you want; or why it would matter.

Those specific macros are for hardware LBR filter emulation/fixup. What
does that have to do with any userspace crud?