BKM on generating a call graph for smatch warnings

Hi, 

Quick question: are there some suggested methods for obtaining a call graph
for a warning that a smatch pattern reports when I run it for the whole kernel? 

I can see that there are a couple of existing patterns (check_capable, check_locking)
that use sql methods for saving the caller_info, but I don't fully understand how it
works, maybe there is some description somewhere on this that I missed? 

Best Regards,
Elena.