linux-kernel - Re: [PATCH v2 25/32] selftests/ftrace: Add function filter on module testcase

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Date:   Fri, 24 Aug 2018 19:25:07 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 25/32] selftests/ftrace: Add function filter on
 module testcase

On Fri, 17 Aug 2018 01:40:59 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Add a testcase for function filter on module.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  .../ftrace/test.d/ftrace/func_mod_trace.tc         |   24 ++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_mod_trace.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_mod_trace.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_mod_trace.tc
> new file mode 100644
> index 000000000000..359380c3834f
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_mod_trace.tc
> @@ -0,0 +1,24 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +# description: ftrace - function trace on module
> +
> +[ ! -f set_ftrace_filter ] && exit_unsupported
> +
> +: "mod: allows to filter a non exist function"
> +echo 'non_exist_func:mod:non_exist_module' > set_ftrace_filter
> +grep -q "non_exist_func" set_ftrace_filter
> +
> +: "mod: on exist module"
> +echo '*:mod:trace_printk' > set_ftrace_filter
> +if ! modprobe trace-printk.ko ; then

Need to remove the '.ko'

-- Steve

> +  echo "No trace-printk sample module - please make CONFIG_SAMPLE_TRACE_PRINTK=
> +m"
> +  exit_unresolved;
> +fi
> +
> +: "Wildcard should be resolved after loading module"
> +grep -q "trace_printk_irq_work" set_ftrace_filter
> +
> +: "After removing the filter becomes empty"
> +rmmod trace_printk
> +test `cat set_ftrace_filter | wc -l` -eq 0