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kprobes: Allow probing on any address belonging to ftrace
On certain architectures, ftrace can reserve multiple instructions at function entry. Rather than rejecting kprobe on addresses other than the exact ftrace call instruction, use the address returned by ftrace to probe at the correct address when CONFIG_KPROBES_ON_FTRACE is enabled. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
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