linux-kernel - Re: [PATCH v3 0/10] libperf and arm64 userspace counter access support

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Message-ID: <CAL_JsqKsr_0Maiv3CJy2UcjhNB_6bZ_wrgzGyUT_MTQj1KzZRQ@mail.gmail.com>
Date:   Tue, 22 Sep 2020 09:23:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Itaru Kitayama <itaru.kitayama@...il.com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Honnappa Nagarahalli <honnappa.nagarahalli@....com>,
        Ian Rogers <irogers@...gle.com>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Raphael Gault <raphael.gault@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/10] libperf and arm64 userspace counter access support

On Sat, Sep 19, 2020 at 1:22 AM Itaru Kitayama <itaru.kitayama@...il.com> wrote:
>
> Rob,
> V3 fails to build on ThunderX2:
>
> $ make
>   BUILD:   Doing 'make -j224' parallel build
>
> Auto-detecting system features:
> ...                         dwarf: [ on  ]
> ...            dwarf_getlocations: [ on  ]
> ...                         glibc: [ on  ]
> ...                          gtk2: [ OFF ]
> ...                        libbfd: [ on  ]
> ...                        libcap: [ on  ]
> ...                        libelf: [ on  ]
> ...                       libnuma: [ on  ]
> ...        numa_num_possible_cpus: [ on  ]
> ...                       libperl: [ on  ]
> ...                     libpython: [ on  ]
> ...                     libcrypto: [ on  ]
> ...                     libunwind: [ OFF ]
> ...            libdw-dwarf-unwind: [ on  ]
> ...                          zlib: [ on  ]
> ...                          lzma: [ on  ]
> ...                     get_cpuid: [ OFF ]
> ...                           bpf: [ on  ]
> ...                        libaio: [ on  ]
> ...                       libzstd: [ on  ]
> ...        disassembler-four-args: [ on  ]
>
> Makefile.config:604: No libunwind found. Please install

I believe this is an existing problem with your setup?

> libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR
> Makefile.config:730: GTK2 not found, disables GTK2 support. Please
> install gtk2-devel or libgtk2.0-dev
> Makefile.config:965: No libbabeltrace found, disables 'perf data' CTF
> format support, please install
> libbabeltrace-dev[el]/libbabeltrace-ctf-dev
> Makefile.config:1009: No openjdk development package found, please
> install JDK package, e.g. openjdk-8-jdk, java-1.8.0-openjdk-devel
>   CC       arch/arm64/tests/user-events.o
>   CC       arch/arm64/tests/arch-tests.o
> In file included from arch/arm64/tests/arch-tests.c:4:
> /home/users/itaru.kitayama/projects/linux/tools/perf/arch/arm64/include/arch-tests.h:10:5:
> error: redundant redeclaration of ‘test__arch_unwind_sample’
> [-Werror=redundant-decls]
>  int test__arch_unwind_sample(struct perf_sample *sample,
>      ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from arch/arm64/tests/arch-tests.c:3:
> /home/users/itaru.kitayama/projects/linux/tools/perf/tests/tests.h:134:5:
> note: previous declaration of ‘test__arch_unwind_sample’ was here
>  int test__arch_unwind_sample(struct perf_sample *sample,
>      ^~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> make[6]: *** [/home/users/itaru.kitayama/projects/linux/tools/build/Makefile.build:97:
> arch/arm64/tests/arch-tests.o] Error 1
> make[6]: *** Waiting for unfinished jobs....
> In file included from arch/arm64/tests/user-events.c:13:
> /home/users/itaru.kitayama/projects/linux/tools/perf/arch/arm64/include/arch-tests.h:10:5:
> error: redundant redeclaration of ‘test__arch_unwind_sample’
> [-Werror=redundant-decls]
>  int test__arch_unwind_sample(struct perf_sample *sample,
>      ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from arch/arm64/tests/user-events.c:12:
> /home/users/itaru.kitayama/projects/linux/tools/perf/tests/tests.h:134:5:
> note: previous declaration of ‘test__arch_unwind_sample’ was here
>  int test__arch_unwind_sample(struct perf_sample *sample,
>      ^~~~~~~~~~~~~~~~~~~~~~~~

These are due to the above issue.

> arch/arm64/tests/user-events.c: In function ‘perf_init’:
> arch/arm64/tests/user-events.c:106:7: error: too few arguments to
> function ‘perf_evsel__mmap’
>   if (!perf_evsel__mmap(evsel)) {

I forgot to update this test. Should be 'perf_evsel__mmap(evsel,
SZ_4K)' here, but that's going to change to 'perf_evsel__mmap(evsel,
0)' with it changing from bytes to pages (minus 1).

Rob