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

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Date:   Tue, 27 Oct 2020 15:55:32 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        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>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] selftests/ftrace: remove _do_fork() leftovers

On 10/23/20 9:51 AM, Steven Rostedt wrote:
> On Fri, 23 Oct 2020 11:49:48 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
>> 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.
>>
>>
> 
> Let me pull in the latest changes, and whip up a patch that works on both
> the older kernels as well as the newer ones.
> 
> -- Steve
> 

Assume this is handled by

selftests/ftrace: Use $FUNCTION_FORK to reference kernel fork function
https://patchwork.kernel.org/project/linux-kselftest/patch/20201026162032.124c728d@gandalf.local.home/

Just making sure.

thanks,
-- Shuah