linux-kernel - Re: [PATCH] perf record: Fix BTF type checks in the off-cpu profiling

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Date:   Wed, 27 Sep 2023 09:09:38 -0700
From:   Song Liu <song@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, Hao Luo <haoluo@...gle.com>,
        bpf@...r.kernel.org
Subject: Re: [PATCH] perf record: Fix BTF type checks in the off-cpu profiling

On Fri, Sep 22, 2023 at 4:44 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> The BTF func proto for a tracepoint has one more argument than the
> actual tracepoint function since it has a context argument at the
> begining.  So it should compare to 5 when the tracepoint has 4
> arguments.
>
>   typedef void (*btf_trace_sched_switch)(void *, bool, struct task_struct *, struct task_struct *, unsigned int);
>
> Also, recent change in the perf tool would use a hand-written minimal
> vmlinux.h to generate BTF in the skeleton.  So it won't have the info
> of the tracepoint.  Anyway it should use the kernel's vmlinux BTF to
> check the type in the kernel.
>
> Fixes: b36888f71c85 ("perf record: Handle argument change in sched_switch")
> Cc: Song Liu <song@...nel.org>
> Cc: Hao Luo <haoluo@...gle.com>
> CC: bpf@...r.kernel.org
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Song Liu <song@...nel.org>