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 16:57:16 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	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 03:16:52PM +0300, Adrian Hunter escreveu:
> On 01/09/15 11:54, Ingo Molnar wrote:
> > 
> > * 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?
> 
> I had a go and came up with this.  Arnaldo, Jiri any comments?

So, I was going to try and merge this series, can you please collect the
Acks by Masami and Jiri and resubmit?

I'd say no need to stop this just to get a build function to use with
this, the test below should do the trick _for this specific instance_
and then, after we get this, you should use it as the initial usecase
for adding the build function, d'accord?

Jiri, are you ok with this?

- Arnaldo
 
> diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
> index 240730d682c1..1b8a32de8504 100644
> --- a/tools/perf/util/intel-pt-decoder/Build
> +++ b/tools/perf/util/intel-pt-decoder/Build
> @@ -6,6 +6,17 @@ inat_tables_maps = util/intel-pt-decoder/x86-opcode-map.txt
>  $(OUTPUT)util/intel-pt-decoder/inat-tables.c: $(inat_tables_script) $(inat_tables_maps)
>  	@$(call echo-cmd,gen)$(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@ || rm -f $@
>  
> -$(OUTPUT)util/intel-pt-decoder/intel-pt-insn-decoder.o: util/intel-pt-decoder/inat.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
> +$(OUTPUT)util/intel-pt-decoder/intel-pt-insn-decoder.o: util/intel-pt-decoder/intel-pt-insn-decoder.c util/intel-pt-decoder/inat.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
> +	@test -d ../../arch/x86 && (( \
> +	diff -B -I'^#include' util/intel-pt-decoder/insn.c ../../arch/x86/lib/insn.c >/dev/null && \
> +	diff -B -I'^#include' util/intel-pt-decoder/inat.c ../../arch/x86/lib/inat.c >/dev/null && \
> +	diff -B util/intel-pt-decoder/x86-opcode-map.txt ../../arch/x86/lib/x86-opcode-map.txt >/dev/null && \
> +	diff -B util/intel-pt-decoder/gen-insn-attr-x86.awk ../../arch/x86/tools/gen-insn-attr-x86.awk >/dev/null && \
> +	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)
> +	$(call if_changed_dep,cc_o_c)
>  
>  CFLAGS_intel-pt-insn-decoder.o += -I$(OUTPUT)util/intel-pt-decoder -Wno-override-init
> 
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