jprobes: make struct jprobe.entry a void *

Currently jprobe.entry is a kprobe_opcode_t *, but that's a lie. On some
platforms it doesn't point to an opcode at all, it points to a function
descriptor.

It's really a pointer to something that the arch code can turn into a function
entry point. And that's what actually happens, none of the generic code ever
looks at jprobe.entry, it's only ever dereferenced by arch code.

So just make it a void *.

Signed-off-by: Michael Ellerman <[e-mail]>
Cc: Prasanna S Panchamukhi <[e-mail]>
Acked-by: Ananth N Mavinakayanahalli <[e-mail]>
Cc: Anil S Keshavamurthy <[e-mail]>
Cc: David S. Miller <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/kprobes.h

···
  */
 struct jprobe {
 	struct kprobe kp;
-	kprobe_opcode_t *entry;	/* probe handling code to jump to */
+	void *entry;	/* probe handling code to jump to */
 };
 
 DECLARE_PER_CPU(struct kprobe *, current_kprobe);