updated uprobes patches

[Jim Keniston]

Here are updated uprobes patches to replace those I posted
May 16.  Utrace is still not in the -mm kernel, so these
patches are against the most recent utrace-enabled -mm
kernel, 2.6.21-rc6-mm1.  If you want to use a more recent
kernel, you'll need to patch in linux-2.6-utrace.patch from
http://people.redhat.com/roland/utrace/2.6-current/ first.

I believe that these uprobes patches address the remainder of
the concerns that Ernie Petrides reported earlier this month.
In particular, struct uprobe and linux/uprobes.h have been reorganized.
Struct uprobe_kimg is renamed uprobe_probept, and the new uprobe_kimg
holds some of what used to reside in struct uprobe.  The API is the
same: [un]register_u[ret]probe().

In linux/uprobe.h, most of the data-structure definitions (and
associated #includes) are hidden behind #ifdef UPROBES_IMPLEMENTATION.
So it's possible that your uprobes modules will need to add #includes
that previously happened to be provided by uprobes.h.

Comments welcome, as always.

Jim Keniston
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