kprobes: Skip kretprobe hit in NMI context to avoid deadlock

Skip kretprobe hit in NMI context, because if an NMI happens
inside the critical section protected by kretprobe_table.lock
and another(or same) kretprobe hit, pre_kretprobe_handler
tries to lock kretprobe_table.lock again.
Normal interrupts have no problem because they are disabled
with the lock.

Signed-off-by: Masami Hiramatsu <[email protected]>
Acked-by: Ananth N Mavinakayanahalli <[email protected]>
Cc: David S. Miller <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Minor edits for clarity. ]
Signed-off-by: Ingo Molnar <[email protected]>

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