Add ability to keep track of callers of symbol_(get|put) ? (take2)

[Matthieu Bec]

I came into the situation previously reported as "[RFC PATCH 1/3] Add 
ability to keep track of callers of symbol_(get|put)"

The thread is here - https://lkml.org/lkml/2007/3/9/519

A patch was submitted back then. Maybe it drop off the radar?

On 3.8.11 kernel, I find that

- for symbol_get, the 'holder' field of the resolved symbol's module 
does not update. mild annoyance IMHO

- for symbol_put, when ref. count reaches 0, there is no 'rmmod' 
equivalent so it just stays there in memory. That somewhat seemed less 
deliberate?

Regards
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