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 11:38:41 +0000
From:	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>
To:	"'Ingo Molnar'" <mingo@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	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

> From: Ingo Molnar [mailto:mingo.kernel.org@...il.com] On Behalf Of Ingo Molnar
> 
> 
> * 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? )

Agreed, what I concern is that someone finds a bug and fixes one of them and
another is not fixed.

I'll see the forked version and check if it can be merged into the kernel.

Thank you,

> 
> Thanks,
> 
> 	Ingo
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