Re: [PATCH] selftests/ftrace: remove _do_fork() leftovers

[Steven Rostedt]

On Sat, 24 Oct 2020 10:31:12 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> 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