Commit a36166c6 authored by Fernando Luis Vazquez Cao's avatar Fernando Luis Vazquez Cao Committed by Linus Torvalds

Use the APIC to determine the hardware processor id - i386

hard_smp_processor_id used to be just a macro that hard-coded
hard_smp_processor_id to 0 in the non SMP case.  When booting non SMP kernels
on hardware where the boot ioapic id is not 0 this turns out to be a problem.
This is happens frequently in the case of kdump and once in a great while in
the case of real hardware.

Use the APIC to determine the hardware processor id in both UP and SMP kernels
to fix this issue.

Notice that hard_smp_processor_id is only used by SMP code or by code that
works with apics so we do not need to handle the case when apics are not
present and hard_smp_processor_id should never be called there.
Signed-off-by: default avatarFernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Cc: "Luck, Tony" <tony.luck@intel.com>
Acked-by: default avatarAndi Kleen <ak@suse.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2f4dfe20
......@@ -119,9 +119,7 @@ int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
return 0;
}
#ifdef CONFIG_SMP
int hard_smp_processor_id(void)
{
return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
}
#endif
......@@ -124,20 +124,6 @@ static inline int num_booting_cpus(void)
return cpus_weight(cpu_callout_map);
}
#ifdef CONFIG_X86_LOCAL_APIC
#ifdef APIC_DEFINITION
extern int hard_smp_processor_id(void);
#else
#include <mach_apicdef.h>
static inline int hard_smp_processor_id(void)
{
/* we don't want to mark this access volatile - bad code generation */
return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
}
#endif
#endif
extern int safe_smp_processor_id(void);
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
......@@ -147,7 +133,6 @@ extern unsigned int num_processors;
#else /* CONFIG_SMP */
#define hard_smp_processor_id() 0
#define safe_smp_processor_id() 0
#define cpu_physical_id(cpu) boot_cpu_physical_apicid
......@@ -157,6 +142,27 @@ extern unsigned int num_processors;
#ifndef __ASSEMBLY__
#ifdef CONFIG_X86_LOCAL_APIC
#ifdef APIC_DEFINITION
extern int hard_smp_processor_id(void);
#else
#include <mach_apicdef.h>
static inline int hard_smp_processor_id(void)
{
/* we don't want to mark this access volatile - bad code generation */
return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
}
#endif /* APIC_DEFINITION */
#else /* CONFIG_X86_LOCAL_APIC */
#ifndef CONFIG_SMP
#define hard_smp_processor_id() 0
#endif
#endif /* CONFIG_X86_LOCAL_APIC */
extern u8 apicid_2_node[];
#ifdef CONFIG_X86_LOCAL_APIC
......
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