Re: [0/3] PATCH Kprobes for x86_64- 2.6.9-final

[Andi Kleen]

> The kprobe notifier has to run for the case where the kernel
> does a userspace access and faults.  This is to handle the
> case of setting a kprobe on a userspace access instruction.
> In such a event, we must unwind the reset the program counter
> so that exception table processing is done with the correct
> PC not the temporary one kprobes is using to execute the
> instruction where the breakpoint currently lives.

Ok that makes sense. Thanks for the explanation (the original 
submitter didn't give one). 

-Andi

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