- Kprobes structure has been modified to support copying of original
  instruction as required by the architecture.  On x86_64 normal pages we
  get from kmalloc or vmalloc are not executable.  Single-stepping an
  instruction on such a page yields an oops.  So instead of storing the
  instruction copies in their respective kprobe objects, we allocate a
  page, map it executable, and store all the instruction copies there and
  store the pointer of the copied instruction in the specific kprobes
  object.

- jprobe_return_end is moved into inline assembly to avoid compiler
  optimization.

- arch_prepare_kprobe() now returns an integer,since
  arch_prepare_kprobe() might fail on other architectures.

- added arch_remove_kprobe() routine, since other architectures requires
  it.
Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>