exec: Don't use cpu_index to detect if cpu_exec_init()'s been called
Instead use QTAIL's tqe_prev field to detect if cpu's been placed in list by cpu_exec_init() which is always set if QTAIL element is in list. Fixes SIGSEGV on failure path in case cpu_index is assigned by board and cpu.relalize() fails before cpu_exec_init() is called. In follow up patches, cpu_index will be assigned by boards that support cpu hot(un)plug and need stable cpu_index that doesn't depend on order cpus are created/removed. Signed-off-by: NIgor Mammedov <imammedo@redhat.com> Reported-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
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