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Commit b840d796 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'cpus4096-for-linus-2' of... 

Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (66 commits)
  x86: export vector_used_by_percpu_irq
  x86: use logical apicid in x2apic_cluster's x2apic_cpu_mask_to_apicid_and()
  sched: nominate preferred wakeup cpu, fix
  x86: fix lguest used_vectors breakage, -v2
  x86: fix warning in arch/x86/kernel/io_apic.c
  sched: fix warning in kernel/sched.c
  sched: move test_sd_parent() to an SMP section of sched.h
  sched: add SD_BALANCE_NEWIDLE at MC and CPU level for sched_mc>0
  sched: activate active load balancing in new idle cpus
  sched: bias task wakeups to preferred semi-idle packages
  sched: nominate preferred wakeup cpu
  sched: favour lower logical cpu number for sched_mc balance
  sched: framework for sched_mc/smt_power_savings=N
  sched: convert BALANCE_FOR_xx_POWER to inline functions
  x86: use possible_cpus=NUM to extend the possible cpus allowed
  x86: fix cpu_mask_to_apicid_and to include cpu_online_mask
  x86: update io_apic.c to the new cpumask code
  x86: Introduce topology_core_cpumask()/topology_thread_cpumask()
  x86: xen: use smp_call_function_many()
  x86: use work_on_cpu in x86/kernel/cpu/mcheck/mce_amd_64.c
  ...

Fixed up trivial conflict in kernel/time/tick-sched.c manually
parents 597b0d21 c3d80000

Documentation/cpu-hotplug.txt

+9 −8
Original line number Diff line number Diff line
@@ -50,16 +50,17 @@ additional_cpus=n (*) Use this to limit hotpluggable cpus. This option sets 
  			cpu_possible_map = cpu_present_map + additional_cpus



(*) Option valid only for following architectures

- x86_64, ia64

- ia64



ia64 and x86_64 use the number of disabled local apics in ACPI tables MADT

to determine the number of potentially hot-pluggable cpus. The implementation

should only rely on this to count the # of cpus, but *MUST* not rely on the

apicid values in those tables for disabled apics. In the event BIOS doesn't

mark such hot-pluggable cpus as disabled entries, one could use this

parameter "additional_cpus=x" to represent those cpus in the cpu_possible_map.

ia64 uses the number of disabled local apics in ACPI tables MADT to

determine the number of potentially hot-pluggable cpus. The implementation

should only rely on this to count the # of cpus, but *MUST* not rely

on the apicid values in those tables for disabled apics. In the event

BIOS doesn't mark such hot-pluggable cpus as disabled entries, one could

use this parameter "additional_cpus=x" to represent those cpus in the

cpu_possible_map.



possible_cpus=n		[s390 only] use this to set hotpluggable cpus.

possible_cpus=n		[s390,x86_64] use this to set hotpluggable cpus.

			This option sets possible_cpus bits in

			cpu_possible_map. Thus keeping the numbers of bits set

			constant even if the machine gets rebooted.

arch/alpha/include/asm/smp.h

+0 −1
Original line number Diff line number Diff line
@@ -45,7 +45,6 @@ extern struct cpuinfo_alpha cpu_data[NR_CPUS]; 
#define raw_smp_processor_id()	(current_thread_info()->cpu)



extern int smp_num_cpus;

#define cpu_possible_map	cpu_present_map



extern void arch_send_call_function_single_ipi(int cpu);

extern void arch_send_call_function_ipi(cpumask_t mask);

arch/alpha/kernel/irq.c

+1 −1
Original line number Diff line number Diff line
@@ -55,7 +55,7 @@ int irq_select_affinity(unsigned int irq) 
	last_cpu = cpu;



	irq_desc[irq].affinity = cpumask_of_cpu(cpu);

	irq_desc[irq].chip->set_affinity(irq, cpumask_of_cpu(cpu));

	irq_desc[irq].chip->set_affinity(irq, cpumask_of(cpu));

	return 0;

}

#endif /* CONFIG_SMP */

arch/alpha/kernel/process.c

+2 −0
Original line number Diff line number Diff line
@@ -94,6 +94,7 @@ common_shutdown_1(void *generic_ptr) 
		flags |= 0x00040000UL; /* "remain halted" */

		*pflags = flags;

		cpu_clear(cpuid, cpu_present_map);

		cpu_clear(cpuid, cpu_possible_map);

		halt();

	}

#endif
@@ -120,6 +121,7 @@ common_shutdown_1(void *generic_ptr) 
#ifdef CONFIG_SMP

	/* Wait for the secondaries to halt. */

	cpu_clear(boot_cpuid, cpu_present_map);

	cpu_clear(boot_cpuid, cpu_possible_map);

	while (cpus_weight(cpu_present_map))

		barrier();

#endif

arch/alpha/kernel/smp.c

+2 −5
Original line number Diff line number Diff line
@@ -70,11 +70,6 @@ enum ipi_message_type { 
/* Set to a secondary's cpuid when it comes online.  */

static int smp_secondary_alive __devinitdata = 0;



/* Which cpus ids came online.  */

cpumask_t cpu_online_map;



EXPORT_SYMBOL(cpu_online_map);



int smp_num_probed;		/* Internal processor count */

int smp_num_cpus = 1;		/* Number that came online.  */

EXPORT_SYMBOL(smp_num_cpus);
@@ -440,6 +435,7 @@ setup_smp(void) 
				((char *)cpubase + i*hwrpb->processor_size);

			if ((cpu->flags & 0x1cc) == 0x1cc) {

				smp_num_probed++;

				cpu_set(i, cpu_possible_map);

				cpu_set(i, cpu_present_map);

				cpu->pal_revision = boot_cpu_palrev;

			}
@@ -473,6 +469,7 @@ smp_prepare_cpus(unsigned int max_cpus) 


	/* Nothing to do on a UP box, or when told not to.  */

	if (smp_num_probed == 1 || max_cpus == 0) {

		cpu_possible_map = cpumask_of_cpu(boot_cpuid);

		cpu_present_map = cpumask_of_cpu(boot_cpuid);

		printk(KERN_INFO "SMP mode deactivated.\n");

		return;