heads up: moving intel-pt-decoder/Build header checks to check_headers.sh

[Arnaldo Carvalho de Melo]

Hi Adrian,

	We've made tools/perf/check-headers.sh the mechanism to check
for drift on kernel file copies we have in tools/, and it assumes that
if we have tools/a/b/c/d, then it came from a/b/c/d in the kernel
sources, e.g. a copy of the kernel's arch/x86/lib/x86-opcode-map.txt
would be in tools/arch/x86/lib/x86-opcode-map.txt.

	That is not the case with the intel-pt-decoder, so I'm thinking
about moving those files to comply with the model used for other copies,
as having it in util/intel-pt-decoder/ isn't strictly required, i.e.
those files could conceivably be used for other purposes besides
decoding intel-pt traces, say for disassembly/annotate, that albeit not
planned (at least by me) for the near future, would be something
interesting to investigate doing.

	IIRC Ingo was the one to point me out this, and now I saw the
warning about it being different flying by in the middle of the build,
differently from what is done by check-headers.sh, that is to show
everything that drifted in one single block, at the start of the build.

	So unless you have a strong objection to this, I'll continue
investigation about how do do it with tools/perf/check-headers.sh,

Thanks,

- Arnaldo

P.S: See how the check-headers.sh stand out at the start and how the
intel-pt-decoder copies get buried in the middle:

[acme@seventh perf]$ rm -rf /tmp/build/perf/ ; mkdir -p /tmp/build/perf ; make -C tools/perf O=/tmp/build/perf install-bin
make: Entering directory '/home/acme/git/perf/tools/perf'
  BUILD:   Doing 'make -j4' parallel build
  HOSTCC   /tmp/build/perf/fixdep.o
  HOSTLD   /tmp/build/perf/fixdep-in.o
  LINK     /tmp/build/perf/fixdep
Warning: Kernel ABI header at 'tools/include/uapi/linux/prctl.h' differs from latest version at 'include/uapi/linux/prctl.h'
Warning: Kernel ABI header at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h'

Auto-detecting system features:
...                         dwarf: [ on  ]
...            dwarf_getlocations: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ on  ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...        numa_num_possible_cpus: [ on  ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ on  ]
...                     libcrypto: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ on  ]
...                          zlib: [ on  ]
...                          lzma: [ on  ]
...                     get_cpuid: [ on  ]
...                           bpf: [ on  ]

  GEN      /tmp/build/perf/common-cmds.h
  MKDIR    /tmp/build/perf/fd/
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  MKDIR    /tmp/build/perf/fs/
  CC       /tmp/build/perf/event-parse.o
  CC       /tmp/build/perf/fs/tracing_path.o
  PERF_VERSION = 4.17.rc6.ge91755
  LD       /tmp/build/perf/fs/libapi-in.o
  CC       /tmp/build/perf/event-plugin.o
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  AR       /tmp/build/perf/libapi.a
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  LINK     /tmp/build/perf/libtraceevent.a
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  GEN      perf-archive
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  GEN      perf-with-kcore
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  CC       /tmp/build/perf/builtin-annotate.o
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  INSTALL  trace_plugins
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Warning: Intel PT: x86 instruction decoder header at 'tools/perf/util/intel-pt-decoder/insn.h' differs from latest version at 'arch/x86/include/asm/insn.h'
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  CC       /tmp/build/perf/util/unwind-libunwind-local.o
  CC       /tmp/build/perf/tests/thread-map.o
  CC       /tmp/build/perf/tests/llvm.o
  CC       /tmp/build/perf/tests/bpf.o
  CC       /tmp/build/perf/tests/topology.o
  CC       /tmp/build/perf/util/unwind-libunwind.o
  CC       /tmp/build/perf/tests/mem.o
  CC       /tmp/build/perf/util/data-convert-bt.o
  CC       /tmp/build/perf/tests/cpumap.o
  CC       /tmp/build/perf/util/zlib.o
  CC       /tmp/build/perf/tests/stat.o
  CC       /tmp/build/perf/util/lzma.o
  CC       /tmp/build/perf/tests/event_update.o
  CC       /tmp/build/perf/util/demangle-java.o
  CC       /tmp/build/perf/tests/event-times.o
  CC       /tmp/build/perf/util/demangle-rust.o
  CC       /tmp/build/perf/tests/expr.o
  CC       /tmp/build/perf/tests/backward-ring-buffer.o
  CC       /tmp/build/perf/util/jitdump.o
  CC       /tmp/build/perf/tests/sdt.o
  CC       /tmp/build/perf/tests/is_printable_array.o
  CC       /tmp/build/perf/tests/bitmap.o
  CC       /tmp/build/perf/tests/perf-hooks.o
  CC       /tmp/build/perf/tests/clang.o
  CC       /tmp/build/perf/util/genelf.o
  CC       /tmp/build/perf/tests/unit_number__scnprintf.o
  CC       /tmp/build/perf/util/genelf_debug.o
  CC       /tmp/build/perf/util/perf-hooks.o
  CC       /tmp/build/perf/tests/mem2node.o
  CC       /tmp/build/perf/tests/dwarf-unwind.o
  FLEX     /tmp/build/perf/util/parse-events-flex.c
  FLEX     /tmp/build/perf/util/pmu-flex.c
  CC       /tmp/build/perf/util/pmu-bison.o
  CC       /tmp/build/perf/tests/llvm-src-base.o
  CC       /tmp/build/perf/tests/llvm-src-kbuild.o
  CC       /tmp/build/perf/tests/llvm-src-prologue.o
  CC       /tmp/build/perf/tests/llvm-src-relocation.o
  CC       /tmp/build/perf/util/expr-bison.o
  CC       /tmp/build/perf/util/parse-events.o
  CC       /tmp/build/perf/util/parse-events-flex.o
  CC       /tmp/build/perf/util/pmu.o
  LD       /tmp/build/perf/tests/perf-in.o
  CC       /tmp/build/perf/util/pmu-flex.o
  LD       /tmp/build/perf/perf-in.o
  LD       /tmp/build/perf/util/libperf-in.o
  LD       /tmp/build/perf/libperf-in.o
  AR       /tmp/build/perf/libperf.a
  LINK     /tmp/build/perf/libperf-gtk.so
  LINK     /tmp/build/perf/perf
  INSTALL  GTK UI
  INSTALL  binaries
  INSTALL  tests
  INSTALL  libperf-jvmti.so
  INSTALL  libexec
  INSTALL  lib
  INSTALL  include/bpf
  INSTALL  lib
  INSTALL  examples/bpf
  INSTALL  perf-archive
  INSTALL  perf-with-kcore
  INSTALL  strace/groups
  INSTALL  perl-scripts
  INSTALL  python-scripts
  INSTALL  perf_completion-script
  INSTALL  perf-tip
make: Leaving directory '/home/acme/git/perf/tools/perf'
[acme@seventh perf]$