Mostly clean ups and small fixes

There's not much changes for the tracing system this release.
Mostly small clean ups and fixes.

The biggest change is to how bprintf works. bprintf is used by
trace_printk() to just save the format and args of a printf call,
and the formatting is done when the trace buffer is read. This is
done to keep the formatting out of the fast path (this was recommended
by you). The issue is when arguments are de-referenced.

If a pointer is saved, and the format has something like "%*pbl",
when the buffer is read, it will de-reference the argument then.
The problem is if the data no longer exists. This can cause the
kernel to oops.

The fix for this was to make these de-reference pointes do
the formatting at the time it is called (the fast path), as
this guarantees that the data exists (and doesn't change later)
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