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Since v4.1 kernel, a new interface for ftrace called "tracefs" was introduced, which is usually mounted in /sys/kernel/tracing. Therefore, tracing files can now be accessed via either the legacy path /sys/kernel/debug/tracing or the newer path /sys/kernel/tracing. Signed-off-by: Fushuai Wang <wangfushuai@baidu.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Tested-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com>