On Wed, 3 Jul 2019 12:09:53 +0900 Masami Hiramatsu <mhiramat@xxxxxxxxxx> 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
