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

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Message-ID: <20150901145525.GD29821@kernel.org>
Date:	Tue, 1 Sep 2015 11:55:25 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	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

Em Tue, Sep 01, 2015 at 03:59:16PM +0200, Jiri Olsa escreveu:
> On Tue, Sep 01, 2015 at 03:16:52PM +0300, Adrian Hunter wrote:
> > On 01/09/15 11:54, Ingo Molnar wrote:
> > > 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?

> > I had a go and came up with this.  Arnaldo, Jiri any comments?

> > diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
> > +	diff -B -I'^#include' util/intel-pt-decoder/insn.h ../../arch/x86/include/asm/insn.h >/dev/null && \
> > +	diff -B -I'^#include' util/intel-pt-decoder/inat.h ../../arch/x86/include/asm/inat.h >/dev/null && \
> > +	diff -B -I'^#include' util/intel-pt-decoder/inat_types.h ../../arch/x86/include/asm/inat_types.h >/dev/null) \
> > +	|| echo "Warning: Intel PT: x86 instruction decoder differs from kernel" >&2 )
> > +	$(call rule_mkdir)
> > +	$(call if_changed_dep,cc_o_c)
 
> seems ok, but it might be nicer to have make function for that
> so we could use it on other places like rbtree.h

That will pose some more hurdles, as there are things like
EXPORT_SYMBOL() and RCU stuff that are ok in the kernel sources, but not
in the tools/ copy...

I.e. fully sharing will put a new burden for kernel developers working
on the to-be-shared code, which is something that is not desired.

I was ok with, hey, tools/ broke because you're sharing code with the
kernel, as probably a tools/ developer would notice that and fix things,
but Linus advised against that.

- Arnaldo
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