linux-kernel - RE: [PATCH V2 1/7] perf tools: Display build warning if x86 instruction decoder differs from kernel

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Date:	Thu, 3 Sep 2015 15:50:55 +0000
From:	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>
To:	"'Adrian Hunter'" <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	"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>,
	Ingo Molnar <mingo@...nel.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 V2 1/7] perf tools: Display build warning if x86
 instruction decoder differs from kernel

> From: Adrian Hunter [mailto:adrian.hunter@...el.com]
> 
> perf tools has a copy of the x86 instruction decoder used by the kernel.
> The expectation is that the copy will be kept more-or-less in-synch
> with the kernel version.  Consequently it is helpful to know if there are
> differences.  This patch adds a check into the perf tools build so that
> a diff is done on the sources, and a warning is printed if they are
> different.  Note that the warning is not fatal and the build continues
> as normal.
> 
> The check is done as part of building the instruction decoder, so, like a
> compiler warning, it is not seen unless the instruction decoder has to be
> re-compiled. e.g.
> 
>     $ make -C tools/perf >/dev/null
>     $ echo "/* blah */" >> tools/perf/util/intel-pt-decoder/inat_types.h
>     $ make -C tools/perf >/dev/null
>     Warning: Intel PT: x86 instruction decoder differs from kernel
>     $ make -C tools/perf >/dev/null
>     $

Looks good to me :)

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Thanks you!

> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/intel-pt-decoder/Build | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
> index 2386322ece4f..0611d619a42e 100644
> --- a/tools/perf/util/intel-pt-decoder/Build
> +++ b/tools/perf/util/intel-pt-decoder/Build
> @@ -7,6 +7,17 @@ $(OUTPUT)util/intel-pt-decoder/inat-tables.c: $(inat_tables_script) $(inat_table
>  	$(call rule_mkdir)
>  	@$(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 ../../kernel -a -d ../../tools -a -d ../perf && (( \
> +	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 )) || true
> +	$(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
> --
> 1.9.1