Look at include/linux/smp.h: on SMP, it includes <asm/smp.h>, on UP it contains a #define smp_num_cpus 1 I assume that someone directly includes <asm/smp.h>. Try to add a #ifndef __LINUX_SMP_H #error Found it! #endif to the beginning of <asm-alpha/smp.h> -- Manfred - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/