linux-kernel - Re: [PATCH] selftests/ftrace: remove _do

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Message-ID: <20201026120323.14058f56@gandalf.local.home>
Date:   Mon, 26 Oct 2020 12:03:23 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Alexander Gordeev <agordeev@...ux.ibm.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: Re: [PATCH] selftests/ftrace: remove _do_fork() leftovers

On Sat, 24 Oct 2020 10:31:12 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > Perhaps we should have:
> > 
> > 	# older kernels have do_fork, but newer kernels have kernel_clone
> > 	echo kernel_clone >> set_ftrace_filter || echo *do_fork >> set_ftrace_filter  
> 
> Good catch. BTW, can we check the filter-bility by grep the pattern from set_ftrace_filter?

I think we need to use /proc/kallsyms, as the kprobe code should still work
if function tracing is disabled, and the function filter files will not
exist.

-- Steve