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remove buffer related arguments from XENOPROF_init operation. This is the first step to allow dynamic mapping/unmapping of xenoprof buffers to enable profiling a domain in passive mode and then switch to active mode (or vice-versa). Currently a domain can only be profiled in a single mode. Also passive domains cannot have oprofile builtin the kernel or passive profiling will fail. Signed-off-by: Jose Renato Santos <jsantos@hpl.hp.com>