[linux-2.6-block.git] / arch / x86 / kernel / setup_percpu.c

// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/percpu.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <linux/smp.h>
#include <linux/topology.h>
#include <linux/pfn.h>
#include <asm/sections.h>
#include <asm/processor.h>
#include <asm/desc.h>
#include <asm/setup.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/highmem.h>
#include <asm/proto.h>
#include <asm/cpumask.h>
#include <asm/cpu.h>
#include <asm/stackprotector.h>

DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number);
EXPORT_PER_CPU_SYMBOL(cpu_number);

#ifdef CONFIG_X86_64
#define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load)
#else
#define BOOT_PERCPU_OFFSET 0
#endif

DEFINE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
EXPORT_PER_CPU_SYMBOL(this_cpu_off);

unsigned long __per_cpu_offset[NR_CPUS] __ro_after_init = {
	[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
};
EXPORT_SYMBOL(__per_cpu_offset);

/*
 * On x86_64 symbols referenced from code should be reachable using
 * 32bit relocations.  Reserve space for static percpu variables in
 * modules so that they are always served from the first chunk which
 * is located at the percpu segment base.  On x86_32, anything can
 * address anywhere.  No need to reserve space in the first chunk.
 */
#ifdef CONFIG_X86_64
#define PERCPU_FIRST_CHUNK_RESERVE	PERCPU_MODULE_RESERVE
#else
#define PERCPU_FIRST_CHUNK_RESERVE	0
#endif

#ifdef CONFIG_X86_32
/**
 * pcpu_need_numa - determine percpu allocation needs to consider NUMA
 *
 * If NUMA is not configured or there is only one NUMA node available,
 * there is no reason to consider NUMA.  This function determines
 * whether percpu allocation should consider NUMA or not.
 *
 * RETURNS:
 * true if NUMA should be considered; otherwise, false.
 */
static bool __init pcpu_need_numa(void)
{
#ifdef CONFIG_NEED_MULTIPLE_NODES
	pg_data_t *last = NULL;
	unsigned int cpu;

	for_each_possible_cpu(cpu) {
		int node = early_cpu_to_node(cpu);

		if (node_online(node) && NODE_DATA(node) &&
		    last && last != NODE_DATA(node))
			return true;

		last = NODE_DATA(node);
	}
#endif
	return false;
}
#endif

/**
 * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
 * @cpu: cpu to allocate for
 * @size: size allocation in bytes
 * @align: alignment
 *
 * Allocate @size bytes aligned at @align for cpu @cpu.  This wrapper
 * does the right thing for NUMA regardless of the current
 * configuration.
 *
 * RETURNS:
 * Pointer to the allocated area on success, NULL on failure.
 */
static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
					unsigned long align)
{
	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
#ifdef CONFIG_NEED_MULTIPLE_NODES
	int node = early_cpu_to_node(cpu);
	void *ptr;

	if (!node_online(node) || !NODE_DATA(node)) {
		ptr = memblock_alloc_from_nopanic(size, align, goal);
		pr_info("cpu %d has no node %d or node-local memory\n",
			cpu, node);
		pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
			 cpu, size, __pa(ptr));
	} else {
		ptr = memblock_alloc_try_nid_nopanic(size, align, goal,
						     MEMBLOCK_ALLOC_ACCESSIBLE,
						     node);

		pr_debug("per cpu data for cpu%d %lu bytes on node%d at %016lx\n",
			 cpu, size, node, __pa(ptr));
	}
	return ptr;
#else
	return memblock_alloc_from_nopanic(size, align, goal);
#endif
}

/*
 * Helpers for first chunk memory allocation
 */
static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
{
	return pcpu_alloc_bootmem(cpu, size, align);
}

static void __init pcpu_fc_free(void *ptr, size_t size)
{
	memblock_free(__pa(ptr), size);
}

static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
{
#ifdef CONFIG_NEED_MULTIPLE_NODES
	if (early_cpu_to_node(from) == early_cpu_to_node(to))
		return LOCAL_DISTANCE;
	else
		return REMOTE_DISTANCE;
#else
	return LOCAL_DISTANCE;
#endif
}

static void __init pcpup_populate_pte(unsigned long addr)
{
	populate_extra_pte(addr);
}

static inline void setup_percpu_segment(int cpu)
{
#ifdef CONFIG_X86_32
	struct desc_struct d = GDT_ENTRY_INIT(0x8092, per_cpu_offset(cpu),
					      0xFFFFF);

	write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PERCPU, &d, DESCTYPE_S);
#endif
}

void __init setup_per_cpu_areas(void)
{
	unsigned int cpu;
	unsigned long delta;
	int rc;

	pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%u nr_node_ids:%d\n",
		NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);

	/*
	 * Allocate percpu area.  Embedding allocator is our favorite;
	 * however, on NUMA configurations, it can result in very
	 * sparse unit mapping and vmalloc area isn't spacious enough
	 * on 32bit.  Use page in that case.
	 */
#ifdef CONFIG_X86_32
	if (pcpu_chosen_fc == PCPU_FC_AUTO && pcpu_need_numa())
		pcpu_chosen_fc = PCPU_FC_PAGE;
#endif
	rc = -EINVAL;
	if (pcpu_chosen_fc != PCPU_FC_PAGE) {
		const size_t dyn_size = PERCPU_MODULE_RESERVE +
			PERCPU_DYNAMIC_RESERVE - PERCPU_FIRST_CHUNK_RESERVE;
		size_t atom_size;

		/*
		 * On 64bit, use PMD_SIZE for atom_size so that embedded
		 * percpu areas are aligned to PMD.  This, in the future,
		 * can also allow using PMD mappings in vmalloc area.  Use
		 * PAGE_SIZE on 32bit as vmalloc space is highly contended
		 * and large vmalloc area allocs can easily fail.
		 */
#ifdef CONFIG_X86_64
		atom_size = PMD_SIZE;
#else
		atom_size = PAGE_SIZE;
#endif
		rc = pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
					    dyn_size, atom_size,
					    pcpu_cpu_distance,
					    pcpu_fc_alloc, pcpu_fc_free);
		if (rc < 0)
			pr_warning("%s allocator failed (%d), falling back to page size\n",
				   pcpu_fc_names[pcpu_chosen_fc], rc);
	}
	if (rc < 0)
		rc = pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
					   pcpu_fc_alloc, pcpu_fc_free,
					   pcpup_populate_pte);
	if (rc < 0)
		panic("cannot initialize percpu area (err=%d)", rc);

	/* alrighty, percpu areas up and running */
	delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
	for_each_possible_cpu(cpu) {
		per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
		per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
		per_cpu(cpu_number, cpu) = cpu;
		setup_percpu_segment(cpu);
		setup_stack_canary_segment(cpu);
		/*
		 * Copy data used in early init routines from the
		 * initial arrays to the per cpu data areas.  These
		 * arrays then become expendable and the *_early_ptr's
		 * are zeroed indicating that the static arrays are
		 * gone.
		 */
#ifdef CONFIG_X86_LOCAL_APIC
		per_cpu(x86_cpu_to_apicid, cpu) =
			early_per_cpu_map(x86_cpu_to_apicid, cpu);
		per_cpu(x86_bios_cpu_apicid, cpu) =
			early_per_cpu_map(x86_bios_cpu_apicid, cpu);
		per_cpu(x86_cpu_to_acpiid, cpu) =
			early_per_cpu_map(x86_cpu_to_acpiid, cpu);
#endif
#ifdef CONFIG_X86_32
		per_cpu(x86_cpu_to_logical_apicid, cpu) =
			early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
#endif
#ifdef CONFIG_X86_64
		per_cpu(irq_stack_ptr, cpu) =
			per_cpu(irq_stack_union.irq_stack, cpu) +
			IRQ_STACK_SIZE;
#endif
#ifdef CONFIG_NUMA
		per_cpu(x86_cpu_to_node_map, cpu) =
			early_per_cpu_map(x86_cpu_to_node_map, cpu);
		/*
		 * Ensure that the boot cpu numa_node is correct when the boot
		 * cpu is on a node that doesn't have memory installed.
		 * Also cpu_up() will call cpu_to_node() for APs when
		 * MEMORY_HOTPLUG is defined, before per_cpu(numa_node) is set
		 * up later with c_init aka intel_init/amd_init.
		 * So set them all (boot cpu and all APs).
		 */
		set_cpu_numa_node(cpu, early_cpu_to_node(cpu));
#endif
		/*
		 * Up to this point, the boot CPU has been using .init.data
		 * area.  Reload any changed state for the boot CPU.
		 */
		if (!cpu)
			switch_to_new_gdt(cpu);
	}

	/* indicate the early static arrays will soon be gone */
#ifdef CONFIG_X86_LOCAL_APIC
	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
	early_per_cpu_ptr(x86_cpu_to_acpiid) = NULL;
#endif
#ifdef CONFIG_X86_32
	early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL;
#endif
#ifdef CONFIG_NUMA
	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
#endif

	/* Setup node to cpumask map */
	setup_node_to_cpumask_map();

	/* Setup cpu initialized, callin, callout masks */
	setup_cpu_local_masks();

	/*
	 * Sync back kernel address range again.  We already did this in
	 * setup_arch(), but percpu data also needs to be available in
	 * the smpboot asm.  We can't reliably pick up percpu mappings
	 * using vmalloc_fault(), because exception dispatch needs
	 * percpu data.
	 *
	 * FIXME: Can the later sync in setup_cpu_entry_areas() replace
	 * this call?
	 */
	sync_initial_page_table();
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
40685236 JP	2	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40685236 JP	3
4fe29a85	4	#include <linux/kernel.h>
523d0fb4	5	#include <linux/export.h>
4fe29a85	6	#include <linux/init.h>
2013288f	7	#include <linux/memblock.h>
4fe29a85	8	#include <linux/percpu.h>
1ecd2765	9	#include <linux/kexec.h>
17b4cceb	10	#include <linux/crash_dump.h>
8a87dd9a JSR	11	#include <linux/smp.h>
8a87dd9a JSR	12	#include <linux/topology.h>
5f5d8405	13	#include <linux/pfn.h>
4fe29a85 GOC	14	#include <asm/sections.h>
4fe29a85 GOC	15	#include <asm/processor.h>
523d0fb4	16	#include <asm/desc.h>
4fe29a85	17	#include <asm/setup.h>
0fc0906e	18	#include <asm/mpspec.h>
76eb4131	19	#include <asm/apicdef.h>
1ecd2765	20	#include <asm/highmem.h>
1a51e3a0	21	#include <asm/proto.h>
06879033	22	#include <asm/cpumask.h>
34019be1	23	#include <asm/cpu.h>
60a5317f	24	#include <asm/stackprotector.h>
76eb4131	25
0816b0f0	26	DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number);
ea927906	27	EXPORT_PER_CPU_SYMBOL(cpu_number);
ea927906	28
1688401a BG	29	#ifdef CONFIG_X86_64
	30	#define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load)
	31	#else
	32	#define BOOT_PERCPU_OFFSET 0
	33	#endif
	34
2c773dd3	35	DEFINE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
1688401a BG	36	EXPORT_PER_CPU_SYMBOL(this_cpu_off);
1688401a BG	37
404f6aac	38	unsigned long __per_cpu_offset[NR_CPUS] __ro_after_init = {
34019be1	39	[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
9939ddaf	40	};
9939ddaf	41	EXPORT_SYMBOL(__per_cpu_offset);
4fe29a85	42
6b19b0c2 TH	43	/*
	44	* On x86_64 symbols referenced from code should be reachable using
	45	* 32bit relocations. Reserve space for static percpu variables in
	46	* modules so that they are always served from the first chunk which
	47	* is located at the percpu segment base. On x86_32, anything can
	48	* address anywhere. No need to reserve space in the first chunk.
	49	*/
	50	#ifdef CONFIG_X86_64
	51	#define PERCPU_FIRST_CHUNK_RESERVE PERCPU_MODULE_RESERVE
	52	#else
	53	#define PERCPU_FIRST_CHUNK_RESERVE 0
	54	#endif
	55
4518e6a0	56	#ifdef CONFIG_X86_32
89c92151 TH	57	/**
	58	* pcpu_need_numa - determine percpu allocation needs to consider NUMA
	59	*
	60	* If NUMA is not configured or there is only one NUMA node available,
	61	* there is no reason to consider NUMA. This function determines
	62	* whether percpu allocation should consider NUMA or not.
	63	*
	64	* RETURNS:
	65	* true if NUMA should be considered; otherwise, false.
	66	*/
	67	static bool __init pcpu_need_numa(void)
	68	{
	69	#ifdef CONFIG_NEED_MULTIPLE_NODES
	70	pg_data_t *last = NULL;
	71	unsigned int cpu;
	72
	73	for_each_possible_cpu(cpu) {
	74	int node = early_cpu_to_node(cpu);
	75
	76	if (node_online(node) && NODE_DATA(node) &&
	77	last && last != NODE_DATA(node))
	78	return true;
	79
	80	last = NODE_DATA(node);
	81	}
	82	#endif
	83	return false;
	84	}
4518e6a0	85	#endif
89c92151	86
5f5d8405 TH	87	/**
	88	* pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
	89	* @cpu: cpu to allocate for
	90	* @size: size allocation in bytes
	91	* @align: alignment
	92	*
	93	* Allocate @size bytes aligned at @align for cpu @cpu. This wrapper
	94	* does the right thing for NUMA regardless of the current
	95	* configuration.
	96	*
	97	* RETURNS:
	98	* Pointer to the allocated area on success, NULL on failure.
	99	*/
	100	static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
	101	unsigned long align)
	102	{
	103	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
	104	#ifdef CONFIG_NEED_MULTIPLE_NODES
	105	int node = early_cpu_to_node(cpu);
	106	void *ptr;
	107
	108	if (!node_online(node) \|\| !NODE_DATA(node)) {
a5159e84	109	ptr = memblock_alloc_from_nopanic(size, align, goal);
5f5d8405 TH	110	pr_info("cpu %d has no node %d or node-local memory\n",
	111	cpu, node);
	112	pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
	113	cpu, size, __pa(ptr));
	114	} else {
bf2886ef	115	ptr = memblock_alloc_try_nid_nopanic(size, align, goal,
97ad1087	116	MEMBLOCK_ALLOC_ACCESSIBLE,
bf2886ef MR	117	node);
bf2886ef MR	118
40685236 JP	119	pr_debug("per cpu data for cpu%d %lu bytes on node%d at %016lx\n",
40685236 JP	120	cpu, size, node, __pa(ptr));
5f5d8405 TH	121	}
	122	return ptr;
	123	#else
a5159e84	124	return memblock_alloc_from_nopanic(size, align, goal);
5f5d8405 TH	125	#endif
	126	}
	127
d4b95f80 TH	128	/*
	129	* Helpers for first chunk memory allocation
	130	*/
3cbc8565	131	static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
d4b95f80	132	{
3cbc8565	133	return pcpu_alloc_bootmem(cpu, size, align);
d4b95f80 TH	134	}
	135
	136	static void __init pcpu_fc_free(void *ptr, size_t size)
	137	{
2013288f	138	memblock_free(__pa(ptr), size);
d4b95f80 TH	139	}
d4b95f80 TH	140
4518e6a0	141	static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
a530b795	142	{
4518e6a0	143	#ifdef CONFIG_NEED_MULTIPLE_NODES
a530b795 TH	144	if (early_cpu_to_node(from) == early_cpu_to_node(to))
	145	return LOCAL_DISTANCE;
	146	else
	147	return REMOTE_DISTANCE;
8ac83757	148	#else
4518e6a0	149	return LOCAL_DISTANCE;
8ac83757	150	#endif
89c92151 TH	151	}
89c92151 TH	152
00ae4064	153	static void __init pcpup_populate_pte(unsigned long addr)
458a3e64 TH	154	{
	155	populate_extra_pte(addr);
	156	}
	157
b2d2f431 BG	158	static inline void setup_percpu_segment(int cpu)
	159	{
	160	#ifdef CONFIG_X86_32
1dd439fe TG	161	struct desc_struct d = GDT_ENTRY_INIT(0x8092, per_cpu_offset(cpu),
1dd439fe TG	162	0xFFFFF);
b2d2f431	163
1dd439fe	164	write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PERCPU, &d, DESCTYPE_S);
b2d2f431 BG	165	#endif
	166	}
	167
4fe29a85 GOC	168	void __init setup_per_cpu_areas(void)
4fe29a85 GOC	169	{
5f5d8405	170	unsigned int cpu;
11124411	171	unsigned long delta;
fb435d52	172	int rc;
a1681965	173
9b130ad5	174	pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%u nr_node_ids:%d\n",
a1681965	175	NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
11124411	176
8ac83757	177	/*
4518e6a0 TH	178	* Allocate percpu area. Embedding allocator is our favorite;
	179	* however, on NUMA configurations, it can result in very
	180	* sparse unit mapping and vmalloc area isn't spacious enough
	181	* on 32bit. Use page in that case.
8ac83757	182	*/
4518e6a0 TH	183	#ifdef CONFIG_X86_32
	184	if (pcpu_chosen_fc == PCPU_FC_AUTO && pcpu_need_numa())
	185	pcpu_chosen_fc = PCPU_FC_PAGE;
	186	#endif
fb435d52	187	rc = -EINVAL;
4518e6a0	188	if (pcpu_chosen_fc != PCPU_FC_PAGE) {
4518e6a0 TH	189	const size_t dyn_size = PERCPU_MODULE_RESERVE +
4518e6a0 TH	190	PERCPU_DYNAMIC_RESERVE - PERCPU_FIRST_CHUNK_RESERVE;
d5e28005 TH	191	size_t atom_size;
	192
	193	/*
	194	* On 64bit, use PMD_SIZE for atom_size so that embedded
	195	* percpu areas are aligned to PMD. This, in the future,
	196	* can also allow using PMD mappings in vmalloc area. Use
	197	* PAGE_SIZE on 32bit as vmalloc space is highly contended
	198	* and large vmalloc area allocs can easily fail.
	199	*/
	200	#ifdef CONFIG_X86_64
	201	atom_size = PMD_SIZE;
	202	#else
	203	atom_size = PAGE_SIZE;
	204	#endif
4518e6a0 TH	205	rc = pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
	206	dyn_size, atom_size,
	207	pcpu_cpu_distance,
	208	pcpu_fc_alloc, pcpu_fc_free);
fb435d52	209	if (rc < 0)
40685236	210	pr_warning("%s allocator failed (%d), falling back to page size\n",
4518e6a0	211	pcpu_fc_names[pcpu_chosen_fc], rc);
fa8a7094	212	}
fb435d52	213	if (rc < 0)
4518e6a0 TH	214	rc = pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
	215	pcpu_fc_alloc, pcpu_fc_free,
	216	pcpup_populate_pte);
fb435d52 TH	217	if (rc < 0)
fb435d52 TH	218	panic("cannot initialize percpu area (err=%d)", rc);
11124411	219
5f5d8405	220	/* alrighty, percpu areas up and running */
11124411 TH	221	delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
11124411 TH	222	for_each_possible_cpu(cpu) {
fb435d52	223	per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
26f80bd6	224	per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
ea927906	225	per_cpu(cpu_number, cpu) = cpu;
b2d2f431	226	setup_percpu_segment(cpu);
60a5317f	227	setup_stack_canary_segment(cpu);
0d77e7f0	228	/*
cf3997f5 TH	229	* Copy data used in early init routines from the
	230	* initial arrays to the per cpu data areas. These
	231	* arrays then become expendable and the *_early_ptr's
	232	* are zeroed indicating that the static arrays are
	233	* gone.
0d77e7f0	234	*/
ec70de8b	235	#ifdef CONFIG_X86_LOCAL_APIC
0d77e7f0	236	per_cpu(x86_cpu_to_apicid, cpu) =
cf3997f5	237	early_per_cpu_map(x86_cpu_to_apicid, cpu);
0d77e7f0	238	per_cpu(x86_bios_cpu_apicid, cpu) =
cf3997f5	239	early_per_cpu_map(x86_bios_cpu_apicid, cpu);
3e9e57fa VK	240	per_cpu(x86_cpu_to_acpiid, cpu) =
3e9e57fa VK	241	early_per_cpu_map(x86_cpu_to_acpiid, cpu);
ec70de8b	242	#endif
4c321ff8 TH	243	#ifdef CONFIG_X86_32
	244	per_cpu(x86_cpu_to_logical_apicid, cpu) =
	245	early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
	246	#endif
1a51e3a0	247	#ifdef CONFIG_X86_64
26f80bd6	248	per_cpu(irq_stack_ptr, cpu) =
cf3997f5	249	per_cpu(irq_stack_union.irq_stack, cpu) +
4950d6d4	250	IRQ_STACK_SIZE;
645a7919	251	#endif
6470aff6 BG	252	#ifdef CONFIG_NUMA
6470aff6 BG	253	per_cpu(x86_cpu_to_node_map, cpu) =
cf3997f5	254	early_per_cpu_map(x86_cpu_to_node_map, cpu);
9aebbdb6	255	/*
a4ce96ac	256	* Ensure that the boot cpu numa_node is correct when the boot
9aebbdb6 YL	257	* cpu is on a node that doesn't have memory installed.
	258	* Also cpu_up() will call cpu_to_node() for APs when
	259	* MEMORY_HOTPLUG is defined, before per_cpu(numa_node) is set
	260	* up later with c_init aka intel_init/amd_init.
	261	* So set them all (boot cpu and all APs).
	262	*/
	263	set_cpu_numa_node(cpu, early_cpu_to_node(cpu));
6470aff6	264	#endif
1a51e3a0	265	/*
c273fb3b	266	* Up to this point, the boot CPU has been using .init.data
2697fbd5	267	* area. Reload any changed state for the boot CPU.
1a51e3a0	268	*/
f6e9456c	269	if (!cpu)
552be871	270	switch_to_new_gdt(cpu);
4fe29a85 GOC	271	}
4fe29a85 GOC	272
0d77e7f0	273	/* indicate the early static arrays will soon be gone */
22f25138	274	#ifdef CONFIG_X86_LOCAL_APIC
0d77e7f0 BG	275	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
0d77e7f0 BG	276	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
3e9e57fa	277	early_per_cpu_ptr(x86_cpu_to_acpiid) = NULL;
22f25138	278	#endif
4c321ff8 TH	279	#ifdef CONFIG_X86_32
	280	early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL;
	281	#endif
645a7919	282	#ifdef CONFIG_NUMA
0d77e7f0 BG	283	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
0d77e7f0 BG	284	#endif
9f0e8d04	285
9f248bde MT	286	/* Setup node to cpumask map */
9f248bde MT	287	setup_node_to_cpumask_map();
c2d1cec1 MT	288
	289	/* Setup cpu initialized, callin, callout masks */
	290	setup_cpu_local_masks();
23b2a4dd	291
23b2a4dd	292	/*
d2b6dc61 AL	293	* Sync back kernel address range again. We already did this in
	294	* setup_arch(), but percpu data also needs to be available in
	295	* the smpboot asm. We can't reliably pick up percpu mappings
	296	* using vmalloc_fault(), because exception dispatch needs
	297	* percpu data.
945fd17a TG	298	*
	299	* FIXME: Can the later sync in setup_cpu_entry_areas() replace
	300	* this call?
23b2a4dd	301	*/
945fd17a	302	sync_initial_page_table();
4fe29a85	303	}