On Wed, 15 Feb 2012 12:46:03 +0530
Prashanth Nageshappa [off-list ref] wrote:

register_kprobe() aborts if the address of the new request falls in a
prohibited area (such as ftrace pouch, __kprobes annotated functions,

I'm sitting here wondering what you meant to type when you typed
"ftrace pouch".  I'm stumped!  But you're not allowed to tell us - that
would take all the fun out of it.

non-kernel text addresses, jump label text). We however don't return the
right error on this abort, resulting in a silent failure - incorrect 
adding/reporting of kprobes ('perf probe do_fork+18' or
'perf probe mcount' for instance).

In V2 we are incorporating Masami Hiramatsu's  feedback.

This patch fixes it by returning -EINVAL upon failure.

While we are here, rename the label used for exit to be more appropriate.

Signed-off-by: Ananth N Mavinakayanahalli <redacted>
Signed-off-by: Prashanth K Nageshappa <redacted>
Cc: stable@vger.kernel.org

So we want this for 3.3 with a -stable backport.