smp_send_safe_nmi_ipi   56 arch/powerpc/include/asm/smp.h extern int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
smp_send_safe_nmi_ipi  239 arch/powerpc/kernel/stacktrace.c 			smp_send_safe_nmi_ipi(cpu, handle_backtrace_ipi, 5 * USEC_PER_SEC);