a355352b97
move definitions that are now equal in type from
smpboot_{32,64}.c to smpboot.c
cpu_callin_map is put temporarily in smp_64.h (already
exists in smp_32.h), and will soon be merged.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/module.h>
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/* Number of siblings per CPU package */
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int smp_num_siblings = 1;
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EXPORT_SYMBOL(smp_num_siblings);
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/* Last level cache ID of each logical CPU */
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DEFINE_PER_CPU(u16, cpu_llc_id) = BAD_APICID;
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/* bitmap of online cpus */
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cpumask_t cpu_online_map __read_mostly;
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EXPORT_SYMBOL(cpu_online_map);
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cpumask_t cpu_callin_map;
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cpumask_t cpu_callout_map;
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cpumask_t cpu_possible_map;
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EXPORT_SYMBOL(cpu_possible_map);
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/* representing HT siblings of each logical CPU */
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DEFINE_PER_CPU(cpumask_t, cpu_sibling_map);
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EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
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/* representing HT and core siblings of each logical CPU */
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DEFINE_PER_CPU(cpumask_t, cpu_core_map);
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EXPORT_PER_CPU_SYMBOL(cpu_core_map);
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/* Per CPU bogomips and other parameters */
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DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
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EXPORT_PER_CPU_SYMBOL(cpu_info);
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#ifdef CONFIG_HOTPLUG_CPU
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int additional_cpus __initdata = -1;
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static __init int setup_additional_cpus(char *s)
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{
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return s && get_option(&s, &additional_cpus) ? 0 : -EINVAL;
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}
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early_param("additional_cpus", setup_additional_cpus);
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/*
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* cpu_possible_map should be static, it cannot change as cpu's
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* are onlined, or offlined. The reason is per-cpu data-structures
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* are allocated by some modules at init time, and dont expect to
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* do this dynamically on cpu arrival/departure.
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* cpu_present_map on the other hand can change dynamically.
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* In case when cpu_hotplug is not compiled, then we resort to current
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* behaviour, which is cpu_possible == cpu_present.
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* - Ashok Raj
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*
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* Three ways to find out the number of additional hotplug CPUs:
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* - If the BIOS specified disabled CPUs in ACPI/mptables use that.
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* - The user can overwrite it with additional_cpus=NUM
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* - Otherwise don't reserve additional CPUs.
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* We do this because additional CPUs waste a lot of memory.
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* -AK
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*/
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__init void prefill_possible_map(void)
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{
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int i;
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int possible;
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if (additional_cpus == -1) {
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if (disabled_cpus > 0)
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additional_cpus = disabled_cpus;
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else
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additional_cpus = 0;
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}
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possible = num_processors + additional_cpus;
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if (possible > NR_CPUS)
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possible = NR_CPUS;
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printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
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possible, max_t(int, possible - num_processors, 0));
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for (i = 0; i < possible; i++)
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cpu_set(i, cpu_possible_map);
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}
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#endif
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