RE: [PATCH 0/4] x86/insn: perf tools: Add a few new x86 instructions

Date: Tue Sep 01 2015 - 07:38:49 EST

> From: Ingo Molnar [] On Behalf Of Ingo Molnar
> * Adrian Hunter <adrian.hunter@xxxxxxxxx> 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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