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    Subject[PATCH v1 1/3] perf env: Track kernel 64-bit mode in environment
    Date
    It's useful to know that the kernel is running in 32-bit or 64-bit
    mode. E.g. We can decide if perf tool is running in compat mode
    based on the info.

    This patch adds an item "kernel_is_64_bit" into session's environment
    structure perf_env, its value is initialized based on the architecture
    string.

    Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    Signed-off-by: Leo Yan <leo.yan@linaro.org>
    ---
    tools/perf/util/env.c | 24 +++++++++++++++++++++++-
    tools/perf/util/env.h | 3 +++
    2 files changed, 26 insertions(+), 1 deletion(-)

    diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
    index ab341050be46..8f7ff0035c41 100644
    --- a/tools/perf/util/env.c
    +++ b/tools/perf/util/env.c
    @@ -219,13 +219,35 @@ void perf_env__exit(struct perf_env *env)
    zfree(&env->hybrid_cpc_nodes);
    }

    -void perf_env__init(struct perf_env *env __maybe_unused)
    +void perf_env__init(struct perf_env *env)
    {
    #ifdef HAVE_LIBBPF_SUPPORT
    env->bpf_progs.infos = RB_ROOT;
    env->bpf_progs.btfs = RB_ROOT;
    init_rwsem(&env->bpf_progs.lock);
    #endif
    + env->kernel_is_64_bit = -1;
    +}
    +
    +static void perf_env__init_kernel_mode(struct perf_env *env)
    +{
    + const char *arch = perf_env__raw_arch(env);
    +
    + if (!strncmp(arch, "x86_64", 6) || !strncmp(arch, "aarch64", 7) ||
    + !strncmp(arch, "arm64", 5) || !strncmp(arch, "mips64", 6) ||
    + !strncmp(arch, "parisc64", 8) || !strncmp(arch, "riscv64", 7) ||
    + !strncmp(arch, "s390x", 5) || !strncmp(arch, "sparc64", 7))
    + env->kernel_is_64_bit = 1;
    + else
    + env->kernel_is_64_bit = 0;
    +}
    +
    +int perf_env__kernel_is_64_bit(struct perf_env *env)
    +{
    + if (env->kernel_is_64_bit == -1)
    + perf_env__init_kernel_mode(env);
    +
    + return env->kernel_is_64_bit;
    }

    int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[])
    diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
    index 6824a7423a2d..1f5175820a05 100644
    --- a/tools/perf/util/env.h
    +++ b/tools/perf/util/env.h
    @@ -61,6 +61,7 @@ struct perf_env {
    unsigned long long total_mem;
    unsigned int msr_pmu_type;
    unsigned int max_branches;
    + int kernel_is_64_bit;

    int nr_cmdline;
    int nr_sibling_cores;
    @@ -143,6 +144,8 @@ extern struct perf_env perf_env;

    void perf_env__exit(struct perf_env *env);

    +int perf_env__kernel_is_64_bit(struct perf_env *env);
    +
    int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]);

    int perf_env__read_cpuid(struct perf_env *env);
    --
    2.25.1
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