powerpc/jprobes: Validate break handler invocation as being due to a jprobe_return()
Fix a circa 2005 FIXME by implementing a check to ensure that we actually got into the jprobe break handler() due to the trap in jprobe_return(). Acked-by: NMasami Hiramatsu <mhiramat@kernel.org> Signed-off-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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