To modify format string to f.e.:

• add log level
• add prefix
• solve [https://stackoverflow.com/questions/54430645/how-to-use-a-variable-as-a-format-string-in-printk|How to use a variable as a format string in printk]]

Special structure struct va_format and special format character %pV was added to Kernel. Examples:

    va_list args;
    struct va_format vaf = {
        .fmt = format,
    };
    va_start(args, format);
    vaf.va = &args;
    printk(KERN_DEBUG "[TPS] %pV", &vaf);
    va_end(args);