x86, apic: explain the purpose of max_physical_apicid
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -50,13 +50,26 @@
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#include <asm/smp.h>
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unsigned int num_processors;
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unsigned disabled_cpus __cpuinitdata;
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/* Processor that is doing the boot up */
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unsigned int boot_cpu_physical_apicid = -1U;
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EXPORT_SYMBOL(boot_cpu_physical_apicid);
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/*
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* The highest APIC ID seen during enumeration.
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*
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* This determines the messaging protocol we can use: if all APIC IDs
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* are in the 0 ... 7 range, then we can use logical addressing which
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* has some performance advantages (better broadcasting).
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*
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* If there's an APIC ID above 8, we use physical addressing.
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*/
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unsigned int max_physical_apicid;
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/* Bitmask of physically existing CPUs */
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/*
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* Bitmask of physically existing CPUs:
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*/
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physid_mask_t phys_cpu_present_map;
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/*
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