updated uprobes patches

[Jim Keniston]

Here are updated uprobes patches to replace those I posted April
20 and April 23:
- 1-uprobes-base.patch
- 2-uprobes-ssol.patch
- 3-uretprobes.patch

Utrace is not currently 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.

These uprobes patches reflect review comments and miscellaneous cleanup
over the past few weeks.  Locking is much simplified.*  Robustness
is improved.  The API is the same: [un]register_u[ret]probe().

Still to do: Reorg of structs uprobe + uprobe_kimg into structs
uprobe + uprobe_kimg + uprobe_probept, to address kernel ABI
backward-compatibility.  This will be a largely cosmetic change,
but it affects a lot of code, so I wanted to keep that change separate.

Comments welcome, as always.

Jim Keniston

*uproc->mutex becomes uproc->rwsem.  uproc->table_rwsem, utask->mutex,
and uk->rwsem go away.
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