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[PATCH] x86_64: Increase the maximum number of local APICs to the maximum

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This is needed for large multinode IBM systems which have a sparse
APIC space in clustered mode, fully covering the available 8 bits.

The previous kernels would limit the local APIC number to 127,
which caused it to reject some of the CPUs at boot.

I increased the maximum and shrunk the apic_version array a bit
to make up for that (the version is only 8 bit, so don't need
an full int to store)

Cc:  Chris McDermott <lcm@us.ibm.com>

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-11-05 17:25:54 +01:00 committed by Linus Torvalds
parent 9e43e1b7c7
commit 8893166ff8
2 changed files with 9 additions and 6 deletions
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11
arch/x86_64/kernel/mpparse.c
View file

@ -42,7 +42,7 @@ int acpi_found_madt;
* Various Linux-internal data structures created from the
* MP-table.
*/
int apic_version [MAX_APICS];
unsigned char apic_version [MAX_APICS];
unsigned char mp_bus_id_to_type [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
@ -108,7 +108,8 @@ static int __init mpf_checksum(unsigned char *mp, int len)
static void __init MP_processor_info (struct mpc_config_processor *m)
{
int ver, cpu;
int cpu;
unsigned char ver;
static int found_bsp=0;
if (!(m->mpc_cpuflag & CPU_ENABLED)) {
@ -133,12 +134,14 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
}
cpu = num_processors++;
if (m->mpc_apicid > MAX_APICS) {
#if MAX_APICS < 255
if ((int)m->mpc_apicid > MAX_APICS) {
printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
m->mpc_apicid, MAX_APICS);
return;
}
#endif
ver = m->mpc_apicver;
physid_set(m->mpc_apicid, phys_cpu_present_map);

4
include/asm-x86_64/mpspec.h
View file

@ -16,7 +16,7 @@
/*
* A maximum of 255 APICs with the current APIC ID architecture.
*/
#define MAX_APICS 128
#define MAX_APICS 255
struct intel_mp_floating
{
@ -173,7 +173,7 @@ extern int smp_found_config;
extern void find_smp_config (void);
extern void get_smp_config (void);
extern int nr_ioapics;
extern int apic_version [MAX_APICS];
extern unsigned char apic_version [MAX_APICS];
extern int mp_irq_entries;
extern struct mpc_config_intsrc mp_irqs [MAX_IRQ_SOURCES];
extern int mpc_default_type;