linux-kernel - Re: [PATCH 2/7] perf test: Use skip in vmlinux kallsyms

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Message-ID: <CAM9d7ch6Xg+gGLsuJ_=X7=wSMRpo324YfRtfHG1=+YD8oG+7vQ@mail.gmail.com>
Date:   Mon, 16 May 2022 20:21:49 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Sohaib Mohamed <sohaib.amhmd@...il.com>,
        Carsten Haitzler <carsten.haitzler@....com>,
        Marco Elver <elver@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Michael Petlan <mpetlan@...hat.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/7] perf test: Use skip in vmlinux kallsyms

Hi Ian,

On Thu, May 12, 2022 at 9:05 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Currently failures in reading vmlinux or kallsyms result in a test
> failure. However, the failure is typically permission related. Prefer to
> flag these failures as skip.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/vmlinux-kallsyms.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/tests/vmlinux-kallsyms.c b/tools/perf/tests/vmlinux-kallsyms.c
> index 93dee542a177..983f32964749 100644
> --- a/tools/perf/tests/vmlinux-kallsyms.c
> +++ b/tools/perf/tests/vmlinux-kallsyms.c
> @@ -114,7 +114,7 @@ static bool is_ignored_symbol(const char *name, char type)
>  static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused,
>                                         int subtest __maybe_unused)
>  {
> -       int err = -1;
> +       int err = TEST_FAIL;
>         struct rb_node *nd;
>         struct symbol *sym;
>         struct map *kallsyms_map, *vmlinux_map, *map;
> @@ -142,7 +142,8 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused
>          * and find the .ko files that match them in /lib/modules/`uname -r`/.
>          */
>         if (machine__create_kernel_maps(&kallsyms) < 0) {
> -               pr_debug("machine__create_kernel_maps ");
> +               pr_info("machine__create_kernel_maps failed");
> +               err = TEST_SKIP;
>                 goto out;
>         }
>
> @@ -158,7 +159,8 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused
>          * code and with the one got from /proc/modules from the "kallsyms" code.
>          */
>         if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms") <= 0) {
> -               pr_debug("dso__load_kallsyms ");
> +               pr_debug("machine__load_kallsyms failed");

For consistency, you might want to use pr_info() here.

Thanks,
Namhyung


> +               err = TEST_SKIP;
>                 goto out;
>         }
>
> @@ -178,7 +180,7 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused
>          * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
>          */
>         if (machine__create_kernel_maps(&vmlinux) < 0) {
> -               pr_debug("machine__create_kernel_maps ");
> +               pr_info("machine__create_kernel_maps failed");
>                 goto out;
>         }
>
> @@ -196,7 +198,7 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused
>          * to fixup the symbols.
>          */
>         if (machine__load_vmlinux_path(&vmlinux) <= 0) {
> -               pr_debug("Couldn't find a vmlinux that matches the kernel running on this machine, skipping test\n");
> +               pr_info("Couldn't find a vmlinux that matches the kernel running on this machine, skipping test\n");
>                 err = TEST_SKIP;
>                 goto out;
>         }
> --
> 2.36.0.550.gb090851708-goog
>