linux-kernel - Re: [PATCH] selftests/ftrace: skip ftrace test if FTRACE was not enabled

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Date:   Tue, 2 Jul 2019 23:18:08 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     shuah <shuah@...nel.org>, Po-Hsu Lin <po-hsu.lin@...onical.com>,
        mingo@...hat.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/ftrace: skip ftrace test if FTRACE was not
 enabled

On Wed, 3 Jul 2019 12:09:53 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > Would something like that work?  
> 
> For older kernel, I think we'd better try to mount debugfs first.

Sure, that's pretty trivial to do. Or what I was thinking, try it if it
fails:

 	if [ -z "$TRACING_DIR" ]; then
 	  save_err=$err_ret
 	  err_ret=$err_skip
	  if mount -t tracefs nodev /sys/kernel/tracing; then
 	    TRACING_DIR="/sys/kernel/tracing"
	  elif mount -t debugfs nodev /sys/kernel/debug; then
 	    TRACING_DIR="/sys/kernel/debug/tracing"
	  else
	    errexit "debugfs is not configured in this kernel"
	  fi
	  if [ ! -d "$TRACING_DIR" ]; then
	    errexit "ftrace is not configured in this kernel"
	  fi
 	  err_ret=$save_err
 	fi

-- Steve