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SubjectRe: [PATCH] selftests/ftrace: skip ftrace test if FTRACE was not enabled
On Wed, 3 Jul 2019 12:09:53 +0900
Masami Hiramatsu <mhiramat@kernel.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

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