rds: Node crashes when trace buffer is opened

rds: Node crashes when trace buffer is opened

The problem is that trace_printk() cannot handle a format string like
%p* which prints out the content from a pointer.  It stores the
pointer value.  When the trace file is opened, that pointer is
de-referenced and causes problems.  To use ftrace with such format
string, __trace_printk() needs to be used.  It stores the formatted
string in the trace buffer instead.

Orabug: 27846191

Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Tom Hromatka <tom.hromatka@oracle.com>