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| author | Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> | 2007-05-09 02:33:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:48 -0700 |
| commit | a36166c6ef45081fea6eeaf5ca785d7ed786b6e2 (patch) | |
| tree | bdb5a99e3c80883cbb84d6e190b4dabefec79032 /arch/i386 | |
| parent | 2f4dfe206a2fc07099dfad77a8ea2f4b4ae2140f (diff) | |
| download | linux-3.10-a36166c6ef45081fea6eeaf5ca785d7ed786b6e2.tar.gz linux-3.10-a36166c6ef45081fea6eeaf5ca785d7ed786b6e2.tar.bz2 linux-3.10-a36166c6ef45081fea6eeaf5ca785d7ed786b6e2.zip | |
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: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Cc: "Luck, Tony" <tony.luck@intel.com>
Acked-by: Andi Kleen <ak@suse.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/mach-generic/probe.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/i386/mach-generic/probe.c b/arch/i386/mach-generic/probe.c index a7b3999bb37..74f3da63442 100644 --- a/arch/i386/mach-generic/probe.c +++ b/arch/i386/mach-generic/probe.c @@ -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 |