ipi_data_ptr 267 arch/arc/kernel/smp.c unsigned long __percpu *ipi_data_ptr = per_cpu_ptr(&ipi_data, cpu); ipi_data_ptr 280 arch/arc/kernel/smp.c new = old = READ_ONCE(*ipi_data_ptr); ipi_data_ptr 282 arch/arc/kernel/smp.c } while (cmpxchg(ipi_data_ptr, old, new) != old);