#include <linux/init.h>#include <linux/sched.h>/* Don't do any NUMA setup on Opteron right now. They seem to be   better off with flat scheduling. This is just for SMT. */#ifdef CONFIG_SCHED_SMTstatic struct sched_group sched_group_cpus[NR_CPUS];static struct sched_group sched_group_phys[NR_CPUS];static DEFINE_PER_CPU(struct sched_domain, cpu_domains);static DEFINE_PER_CPU(struct sched_domain, phys_domains);__init void arch_init_sched_domains(void){	int i;	struct sched_group *first = NULL, *last = NULL;	/* Set up domains */	for_each_cpu(i) {		struct sched_domain *cpu_domain = &per_cpu(cpu_domains, i);		struct sched_domain *phys_domain = &per_cpu(phys_domains, i);		*cpu_domain = SD_SIBLING_INIT;		/* Disable SMT NICE for CMP */		/* RED-PEN use a generic flag */ 		if (cpu_data[i].x86_vendor == X86_VENDOR_AMD) 			cpu_domain->flags &= ~SD_SHARE_CPUPOWER; 		cpu_domain->span = cpu_sibling_map[i];		cpu_domain->parent = phys_domain;		cpu_domain->groups = &sched_group_cpus[i];		*phys_domain = SD_CPU_INIT;		phys_domain->span = cpu_possible_map;		phys_domain->groups = &sched_group_phys[first_cpu(cpu_domain->span)];	}	/* Set up CPU (sibling) groups */	for_each_cpu(i) {		struct sched_domain *cpu_domain = &per_cpu(cpu_domains, i);		int j;		first = last = NULL;		if (i != first_cpu(cpu_domain->span))			continue;		for_each_cpu_mask(j, cpu_domain->span) {			struct sched_group *cpu = &sched_group_cpus[j];			cpus_clear(cpu->cpumask);			cpu_set(j, cpu->cpumask);			cpu->cpu_power = SCHED_LOAD_SCALE;			if (!first)				first = cpu;			if (last)				last->next = cpu;			last = cpu;		}		last->next = first;	}	first = last = NULL;	/* Set up physical groups */	for_each_cpu(i) {		struct sched_domain *cpu_domain = &per_cpu(cpu_domains, i);		struct sched_group *cpu = &sched_group_phys[i];		if (i != first_cpu(cpu_domain->span))			continue;		cpu->cpumask = cpu_domain->span;		/*		 * Make each extra sibling increase power by 10% of		 * the basic CPU. This is very arbitrary.		 */		cpu->cpu_power = SCHED_LOAD_SCALE + SCHED_LOAD_SCALE*(cpus_weight(cpu->cpumask)-1) / 10;		if (!first)			first = cpu;		if (last)			last->next = cpu;		last = cpu;	}	last->next = first;	mb();	for_each_cpu(i) {		struct sched_domain *cpu_domain = &per_cpu(cpu_domains, i);		cpu_attach_domain(cpu_domain, i);	}}#endif