Mon 20. 09. 2021 - 09:56:05  
#ifdef __SMP__
#error "Me no hablo Alpha SMP"
#else
#define irq_enter(cpu, irq) (++local_irq_count[cpu])
#define irq_exit(cpu, irq) (--local_irq_count[cpu])
#endif
-- from kernel 2.1.90, arch/alpha/kernel/irc.c