linux-kernel - Re: [PATCH 0/4] x86/insn: perf tools: Add a few new x86 instructions

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Date:	Tue, 1 Sep 2015 10:54:32 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Qiaowei Ren <qiaowei.ren@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/4] x86/insn: perf tools: Add a few new x86 instructions

* Adrian Hunter <adrian.hunter@...el.com> wrote:

> Hi
> 
> perf tools has a copy of the x86 instruction decoder for decoding
> Intel PT. [...]

So that's the arch/x86/lib/insn.c instruction length decoder that the kernel uses 
for kprobes et al - and the two versions already forked slightly:

-#include "inat.h"
-#include "insn.h"
+#include <asm/inat.h>
+#include <asm/insn.h>

it would be nice to add a diff check to the perf build, and (non-fatally) warn 
during the build if the two versions depart from each other?

This will make sure the two versions are fully in sync in the long run as well.

( Alternatively we could perhaps also librarize it into tools/lib/, and teach the 
  kernel build to pick that one up? )

Thanks,

	Ingo
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