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authorTony Luck <tony.luck@intel.com>2006-02-15 18:17:57 -0500
committerTony Luck <tony.luck@intel.com>2006-02-15 18:17:57 -0500
commit72166c35f0e15e5081e51304de48e73f8fdf5498 (patch)
tree0515dfa0fc442f92ecbb9add2bc53ca86016a8d6
parentb05de01ae1c76b7d61da21bbcc26345bf7a9052f (diff)
parenta6b14fa6fdc01ab3519c2729624f808677539b59 (diff)
Pull fix-cpu-possible-map into release branch
-rw-r--r--arch/ia64/kernel/acpi.c56
-rw-r--r--arch/ia64/kernel/setup.c4
-rw-r--r--arch/ia64/kernel/smpboot.c5
-rw-r--r--include/asm-ia64/acpi.h2
4 files changed, 63 insertions, 4 deletions
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index d2702c419cf8..34795ede72e0 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -761,6 +761,62 @@ int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
761 return (0); 761 return (0);
762} 762}
763 763
764int additional_cpus __initdata = -1;
765
766static __init int setup_additional_cpus(char *s)
767{
768 if (s)
769 additional_cpus = simple_strtol(s, NULL, 0);
770
771 return 0;
772}
773
774early_param("additional_cpus", setup_additional_cpus);
775
776/*
777 * cpu_possible_map should be static, it cannot change as cpu's
778 * are onlined, or offlined. The reason is per-cpu data-structures
779 * are allocated by some modules at init time, and dont expect to
780 * do this dynamically on cpu arrival/departure.
781 * cpu_present_map on the other hand can change dynamically.
782 * In case when cpu_hotplug is not compiled, then we resort to current
783 * behaviour, which is cpu_possible == cpu_present.
784 * - Ashok Raj
785 *
786 * Three ways to find out the number of additional hotplug CPUs:
787 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
788 * - The user can overwrite it with additional_cpus=NUM
789 * - Otherwise don't reserve additional CPUs.
790 */
791__init void prefill_possible_map(void)
792{
793 int i;
794 int possible, disabled_cpus;
795
796 disabled_cpus = total_cpus - available_cpus;
797 if (additional_cpus == -1) {
798 if (disabled_cpus > 0) {
799 possible = total_cpus;
800 additional_cpus = disabled_cpus;
801 }
802 else {
803 possible = available_cpus;
804 additional_cpus = 0;
805 }
806 } else {
807 possible = available_cpus + additional_cpus;
808 }
809 if (possible > NR_CPUS)
810 possible = NR_CPUS;
811
812 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
813 possible,
814 max_t(int, additional_cpus, 0));
815
816 for (i = 0; i < possible; i++)
817 cpu_set(i, cpu_possible_map);
818}
819
764int acpi_map_lsapic(acpi_handle handle, int *pcpu) 820int acpi_map_lsapic(acpi_handle handle, int *pcpu)
765{ 821{
766 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 822 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 35f7835294a3..3258e09278d0 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -430,6 +430,7 @@ setup_arch (char **cmdline_p)
430 if (early_console_setup(*cmdline_p) == 0) 430 if (early_console_setup(*cmdline_p) == 0)
431 mark_bsp_online(); 431 mark_bsp_online();
432 432
433 parse_early_param();
433#ifdef CONFIG_ACPI 434#ifdef CONFIG_ACPI
434 /* Initialize the ACPI boot-time table parser */ 435 /* Initialize the ACPI boot-time table parser */
435 acpi_table_init(); 436 acpi_table_init();
@@ -688,6 +689,9 @@ void
688setup_per_cpu_areas (void) 689setup_per_cpu_areas (void)
689{ 690{
690 /* start_kernel() requires this... */ 691 /* start_kernel() requires this... */
692#ifdef CONFIG_ACPI_HOTPLUG_CPU
693 prefill_possible_map();
694#endif
691} 695}
692 696
693/* 697/*
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 8f44e7d2df66..b681ef34a86e 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -129,7 +129,7 @@ DEFINE_PER_CPU(int, cpu_state);
129/* Bitmasks of currently online, and possible CPUs */ 129/* Bitmasks of currently online, and possible CPUs */
130cpumask_t cpu_online_map; 130cpumask_t cpu_online_map;
131EXPORT_SYMBOL(cpu_online_map); 131EXPORT_SYMBOL(cpu_online_map);
132cpumask_t cpu_possible_map; 132cpumask_t cpu_possible_map = CPU_MASK_NONE;
133EXPORT_SYMBOL(cpu_possible_map); 133EXPORT_SYMBOL(cpu_possible_map);
134 134
135cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; 135cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
@@ -506,9 +506,6 @@ smp_build_cpu_map (void)
506 506
507 for (cpu = 0; cpu < NR_CPUS; cpu++) { 507 for (cpu = 0; cpu < NR_CPUS; cpu++) {
508 ia64_cpu_to_sapicid[cpu] = -1; 508 ia64_cpu_to_sapicid[cpu] = -1;
509#ifdef CONFIG_HOTPLUG_CPU
510 cpu_set(cpu, cpu_possible_map);
511#endif
512 } 509 }
513 510
514 ia64_cpu_to_sapicid[0] = boot_cpu_id; 511 ia64_cpu_to_sapicid[0] = boot_cpu_id;
diff --git a/include/asm-ia64/acpi.h b/include/asm-ia64/acpi.h
index 3a544ffc5008..f7a517654308 100644
--- a/include/asm-ia64/acpi.h
+++ b/include/asm-ia64/acpi.h
@@ -106,6 +106,8 @@ extern unsigned int can_cpei_retarget(void);
106extern unsigned int is_cpu_cpei_target(unsigned int cpu); 106extern unsigned int is_cpu_cpei_target(unsigned int cpu);
107extern void set_cpei_target_cpu(unsigned int cpu); 107extern void set_cpei_target_cpu(unsigned int cpu);
108extern unsigned int get_cpei_target_cpu(void); 108extern unsigned int get_cpei_target_cpu(void);
109extern void prefill_possible_map(void);
110extern int additional_cpus;
109 111
110#ifdef CONFIG_ACPI_NUMA 112#ifdef CONFIG_ACPI_NUMA
111/* Proximity bitmap length; _PXM is at most 255 (8 bit)*/ 113/* Proximity bitmap length; _PXM is at most 255 (8 bit)*/