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[PATCH] x86: hot plug CPU to support physical add of new processors

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The patch allows physical bring-up of new processors (not initially present
in the configuration) from facilities such as driver/utility implemented on
a platform.  The actual method of making processors available is up to the
platform implementation.

Signed-off-by: Natalie Protasevich <Natalie.Protasevich@unisys.com>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Zwane Mwaikambo <zwane@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Natalie Protasevich 2005-10-30 14:59:32 -08:00 • committed by Linus Torvalds
parent ca140fdadb
commit 9f40a72a7e
3 changed files with 11 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

8
arch/i386/kernel/irq.c
View file

@ -218,7 +218,7 @@ int show_interrupts(struct seq_file *p, void *v)
if (i == 0) { if (i == 0) {
seq_printf(p, " "); seq_printf(p, " ");
for_each_cpu(j) for_each_online_cpu(j)
seq_printf(p, "CPU%d ",j); seq_printf(p, "CPU%d ",j);
seq_putc(p, '\n'); seq_putc(p, '\n');
} }
@ -232,7 +232,7 @@ int show_interrupts(struct seq_file *p, void *v)
#ifndef CONFIG_SMP #ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i)); seq_printf(p, "%10u ", kstat_irqs(i));
#else #else
for_each_cpu(j) for_each_online_cpu(j)
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif #endif
seq_printf(p, " %14s", irq_desc[i].handler->typename); seq_printf(p, " %14s", irq_desc[i].handler->typename);
@ -246,12 +246,12 @@ skip:
spin_unlock_irqrestore(&irq_desc[i].lock, flags); spin_unlock_irqrestore(&irq_desc[i].lock, flags);
} else if (i == NR_IRQS) { } else if (i == NR_IRQS) {
seq_printf(p, "NMI: "); seq_printf(p, "NMI: ");
for_each_cpu(j) for_each_online_cpu(j)
seq_printf(p, "%10u ", nmi_count(j)); seq_printf(p, "%10u ", nmi_count(j));
seq_putc(p, '\n'); seq_putc(p, '\n');
#ifdef CONFIG_X86_LOCAL_APIC #ifdef CONFIG_X86_LOCAL_APIC
seq_printf(p, "LOC: "); seq_printf(p, "LOC: ");
for_each_cpu(j) for_each_online_cpu(j)
seq_printf(p, "%10u ", seq_printf(p, "%10u ",
per_cpu(irq_stat,j).apic_timer_irqs); per_cpu(irq_stat,j).apic_timer_irqs);
seq_putc(p, '\n'); seq_putc(p, '\n');

6
arch/i386/kernel/mpparse.c
View file

@ -69,7 +69,7 @@ unsigned int def_to_bigsmp = 0;
/* Processor that is doing the boot up */ /* Processor that is doing the boot up */
unsigned int boot_cpu_physical_apicid = -1U; unsigned int boot_cpu_physical_apicid = -1U;
/* Internal processor count */ /* Internal processor count */
static unsigned int __initdata num_processors; static unsigned int __devinitdata num_processors;
/* Bitmask of physically existing CPUs */ /* Bitmask of physically existing CPUs */
physid_mask_t phys_cpu_present_map; physid_mask_t phys_cpu_present_map;
@ -119,7 +119,7 @@ static int MP_valid_apicid(int apicid, int version)
} }
#endif #endif
static void __init MP_processor_info (struct mpc_config_processor *m) static void __devinit MP_processor_info (struct mpc_config_processor *m)
{ {
int ver, apicid; int ver, apicid;
physid_mask_t phys_cpu; physid_mask_t phys_cpu;
@ -834,7 +834,7 @@ void __init mp_register_lapic_address (
} }
void __init mp_register_lapic ( void __devinit mp_register_lapic (
u8 id, u8 id,
u8 enabled) u8 enabled)
{ {

4
arch/i386/kernel/smpboot.c
View file

@ -87,7 +87,11 @@ EXPORT_SYMBOL(cpu_online_map);
cpumask_t cpu_callin_map; cpumask_t cpu_callin_map;
cpumask_t cpu_callout_map; cpumask_t cpu_callout_map;
EXPORT_SYMBOL(cpu_callout_map); EXPORT_SYMBOL(cpu_callout_map);
#ifdef CONFIG_HOTPLUG_CPU
cpumask_t cpu_possible_map = CPU_MASK_ALL;
#else
cpumask_t cpu_possible_map; cpumask_t cpu_possible_map;
#endif
EXPORT_SYMBOL(cpu_possible_map); EXPORT_SYMBOL(cpu_possible_map);
static cpumask_t smp_commenced_mask; static cpumask_t smp_commenced_mask;