On Sat, 24 Oct 2020 10:31:12 +0900
Masami Hiramatsu <mhira...@kernel.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

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