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

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Date:   Fri, 23 Oct 2020 11:49:48 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexander Gordeev <agordeev@...ux.ibm.com>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH] selftests/ftrace: remove _do_fork() leftovers

On Fri, 23 Oct 2020 17:12:44 +0200
Alexander Gordeev <agordeev@...ux.ibm.com> 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  
> 
> Would you suggest to do the same with all occurences in
> eea11285dab3 ("tracing: switch to kernel_clone()")?
> Otherwise it does not really make sense to just fix couple
> of tests out of dozens.

Yes. I haven't pulled in the updated tests, so I haven't hit the errors yet
(nor have I merged my work with the switch to the new name yet). So those
will most definitely break my tests.

But because it's a more generic issue, we should have a way to find what to
use. Perhaps add to the test.d/functions, something like:

FUNCTION_FORK=`(if grep '\bkernel_clone\b' /proc/kallsyms > /dev/null; then
                echo kernel_clone; else echo '_do_fork'; fi)`

and use $FUNCTION_FORK everywhere that references it.

-- Steve