[RFC] [PATCH 3] uprobes: return probes

[Jim Keniston]

This patch implements user-space return probes (uretprobes) atop
the two uprobes patches I posted on Friday -- e.g.,
http://sources.redhat.com/ml/systemtap/2007-q2/msg00108.html

The big difference from previous implementations of uretprobes is that
the API function init_uretprobes() is gone.  Uprobes uses slot 0 of
the SSOL area for the uretprobe trampoline, so you no longer have to
figure out where to put the trampoline.

Comments welcome.

Jim Keniston
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