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Date:   Tue, 26 May 2020 23:39:13 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Song Liu <songliubraving@fb.com>
Cc:     linux-kernel@vger.kernel.org, kernel-team@fb.com,
        Ingo Molnar <mingo@redhat.com>,
        Steven Rostedt <rostedt@goodmis.org>,
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        Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Alexey Budankov <alexey.budankov@linux.intel.com>
Subject: Re: [RFC] perf/core: allow ftrace for functions in
 kernel/event/core.c
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On Tue, May 26, 2020 at 02:28:26PM -0700, Song Liu wrote:
> It is useful to trace functions in kernel/event/core.c. Allow ftrace for
> them by removing $(CC_FLAGS_FTRACE) from Makefile.

Did you try using the ftrace event with perf with this on?