4 * Copyright (C) 2002 Anton Blanchard <anton@au.ibm.com>, IBM
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 #include <linux/threads.h>
12 #include <linux/bootmem.h>
13 #include <linux/init.h>
15 #include <linux/mmzone.h>
16 #include <linux/module.h>
17 #include <linux/nodemask.h>
18 #include <linux/cpu.h>
19 #include <linux/notifier.h>
20 #include <linux/lmb.h>
22 #include <asm/sparsemem.h>
24 #include <asm/system.h>
27 static int numa_enabled = 1;
29 static char *cmdline __initdata;
31 static int numa_debug;
32 #define dbg(args...) if (numa_debug) { printk(KERN_INFO args); }
34 int numa_cpu_lookup_table[NR_CPUS];
35 cpumask_t numa_cpumask_lookup_table[MAX_NUMNODES];
36 struct pglist_data *node_data[MAX_NUMNODES];
38 EXPORT_SYMBOL(numa_cpu_lookup_table);
39 EXPORT_SYMBOL(numa_cpumask_lookup_table);
40 EXPORT_SYMBOL(node_data);
42 static int min_common_depth;
43 static int n_mem_addr_cells, n_mem_size_cells;
45 static int __cpuinit fake_numa_create_new_node(unsigned long end_pfn,
48 unsigned long long mem;
50 static unsigned int fake_nid;
51 static unsigned long long curr_boundary;
54 * Modify node id, iff we started creating NUMA nodes
55 * We want to continue from where we left of the last time
60 * In case there are no more arguments to parse, the
61 * node_id should be the same as the last fake node id
62 * (we've handled this above).
67 mem = memparse(p, &p);
71 if (mem < curr_boundary)
76 if ((end_pfn << PAGE_SHIFT) > mem) {
78 * Skip commas and spaces
80 while (*p == ',' || *p == ' ' || *p == '\t')
86 dbg("created new fake_node with id %d\n", fake_nid);
92 static void __cpuinit map_cpu_to_node(int cpu, int node)
94 numa_cpu_lookup_table[cpu] = node;
96 dbg("adding cpu %d to node %d\n", cpu, node);
98 if (!(cpu_isset(cpu, numa_cpumask_lookup_table[node])))
99 cpu_set(cpu, numa_cpumask_lookup_table[node]);
102 #ifdef CONFIG_HOTPLUG_CPU
103 static void unmap_cpu_from_node(unsigned long cpu)
105 int node = numa_cpu_lookup_table[cpu];
107 dbg("removing cpu %lu from node %d\n", cpu, node);
109 if (cpu_isset(cpu, numa_cpumask_lookup_table[node])) {
110 cpu_clear(cpu, numa_cpumask_lookup_table[node]);
112 printk(KERN_ERR "WARNING: cpu %lu not found in node %d\n",
116 #endif /* CONFIG_HOTPLUG_CPU */
118 static struct device_node * __cpuinit find_cpu_node(unsigned int cpu)
120 unsigned int hw_cpuid = get_hard_smp_processor_id(cpu);
121 struct device_node *cpu_node = NULL;
122 const unsigned int *interrupt_server, *reg;
125 while ((cpu_node = of_find_node_by_type(cpu_node, "cpu")) != NULL) {
126 /* Try interrupt server first */
127 interrupt_server = of_get_property(cpu_node,
128 "ibm,ppc-interrupt-server#s", &len);
130 len = len / sizeof(u32);
132 if (interrupt_server && (len > 0)) {
134 if (interrupt_server[len] == hw_cpuid)
138 reg = of_get_property(cpu_node, "reg", &len);
139 if (reg && (len > 0) && (reg[0] == hw_cpuid))
147 /* must hold reference to node during call */
148 static const int *of_get_associativity(struct device_node *dev)
150 return of_get_property(dev, "ibm,associativity", NULL);
153 /* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
156 static int of_node_to_nid_single(struct device_node *device)
159 const unsigned int *tmp;
161 if (min_common_depth == -1)
164 tmp = of_get_associativity(device);
168 if (tmp[0] >= min_common_depth)
169 nid = tmp[min_common_depth];
171 /* POWER4 LPAR uses 0xffff as invalid node */
172 if (nid == 0xffff || nid >= MAX_NUMNODES)
178 /* Walk the device tree upwards, looking for an associativity id */
179 int of_node_to_nid(struct device_node *device)
181 struct device_node *tmp;
186 nid = of_node_to_nid_single(device);
191 device = of_get_parent(tmp);
198 EXPORT_SYMBOL_GPL(of_node_to_nid);
201 * In theory, the "ibm,associativity" property may contain multiple
202 * associativity lists because a resource may be multiply connected
203 * into the machine. This resource then has different associativity
204 * characteristics relative to its multiple connections. We ignore
205 * this for now. We also assume that all cpu and memory sets have
206 * their distances represented at a common level. This won't be
207 * true for hierarchical NUMA.
209 * In any case the ibm,associativity-reference-points should give
210 * the correct depth for a normal NUMA system.
212 * - Dave Hansen <haveblue@us.ibm.com>
214 static int __init find_min_common_depth(void)
217 const unsigned int *ref_points;
218 struct device_node *rtas_root;
221 rtas_root = of_find_node_by_path("/rtas");
227 * this property is 2 32-bit integers, each representing a level of
228 * depth in the associativity nodes. The first is for an SMP
229 * configuration (should be all 0's) and the second is for a normal
230 * NUMA configuration.
232 ref_points = of_get_property(rtas_root,
233 "ibm,associativity-reference-points", &len);
235 if ((len >= 1) && ref_points) {
236 depth = ref_points[1];
238 dbg("NUMA: ibm,associativity-reference-points not found.\n");
241 of_node_put(rtas_root);
246 static void __init get_n_mem_cells(int *n_addr_cells, int *n_size_cells)
248 struct device_node *memory = NULL;
250 memory = of_find_node_by_type(memory, "memory");
252 panic("numa.c: No memory nodes found!");
254 *n_addr_cells = of_n_addr_cells(memory);
255 *n_size_cells = of_n_size_cells(memory);
259 static unsigned long __devinit read_n_cells(int n, const unsigned int **buf)
261 unsigned long result = 0;
264 result = (result << 32) | **buf;
270 struct of_drconf_cell {
278 #define DRCONF_MEM_ASSIGNED 0x00000008
279 #define DRCONF_MEM_AI_INVALID 0x00000040
280 #define DRCONF_MEM_RESERVED 0x00000080
283 * Read the next lmb list entry from the ibm,dynamic-memory property
284 * and return the information in the provided of_drconf_cell structure.
286 static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp)
290 drmem->base_addr = read_n_cells(n_mem_addr_cells, cellp);
293 drmem->drc_index = cp[0];
294 drmem->reserved = cp[1];
295 drmem->aa_index = cp[2];
296 drmem->flags = cp[3];
302 * Retreive and validate the ibm,dynamic-memory property of the device tree.
304 * The layout of the ibm,dynamic-memory property is a number N of lmb
305 * list entries followed by N lmb list entries. Each lmb list entry
306 * contains information as layed out in the of_drconf_cell struct above.
308 static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
313 prop = of_get_property(memory, "ibm,dynamic-memory", &len);
314 if (!prop || len < sizeof(unsigned int))
319 /* Now that we know the number of entries, revalidate the size
320 * of the property read in to ensure we have everything
322 if (len < (entries * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int))
330 * Retreive and validate the ibm,lmb-size property for drconf memory
331 * from the device tree.
333 static u64 of_get_lmb_size(struct device_node *memory)
338 prop = of_get_property(memory, "ibm,lmb-size", &len);
339 if (!prop || len < sizeof(unsigned int))
342 return read_n_cells(n_mem_size_cells, &prop);
345 struct assoc_arrays {
352 * Retreive and validate the list of associativity arrays for drconf
353 * memory from the ibm,associativity-lookup-arrays property of the
356 * The layout of the ibm,associativity-lookup-arrays property is a number N
357 * indicating the number of associativity arrays, followed by a number M
358 * indicating the size of each associativity array, followed by a list
359 * of N associativity arrays.
361 static int of_get_assoc_arrays(struct device_node *memory,
362 struct assoc_arrays *aa)
367 prop = of_get_property(memory, "ibm,associativity-lookup-arrays", &len);
368 if (!prop || len < 2 * sizeof(unsigned int))
371 aa->n_arrays = *prop++;
372 aa->array_sz = *prop++;
374 /* Now that we know the number of arrrays and size of each array,
375 * revalidate the size of the property read in.
377 if (len < (aa->n_arrays * aa->array_sz + 2) * sizeof(unsigned int))
385 * This is like of_node_to_nid_single() for memory represented in the
386 * ibm,dynamic-reconfiguration-memory node.
388 static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
389 struct assoc_arrays *aa)
392 int nid = default_nid;
395 if (min_common_depth > 0 && min_common_depth <= aa->array_sz &&
396 !(drmem->flags & DRCONF_MEM_AI_INVALID) &&
397 drmem->aa_index < aa->n_arrays) {
398 index = drmem->aa_index * aa->array_sz + min_common_depth - 1;
399 nid = aa->arrays[index];
401 if (nid == 0xffff || nid >= MAX_NUMNODES)
409 * Figure out to which domain a cpu belongs and stick it there.
410 * Return the id of the domain used.
412 static int __cpuinit numa_setup_cpu(unsigned long lcpu)
415 struct device_node *cpu = find_cpu_node(lcpu);
422 nid = of_node_to_nid_single(cpu);
424 if (nid < 0 || !node_online(nid))
425 nid = any_online_node(NODE_MASK_ALL);
427 map_cpu_to_node(lcpu, nid);
434 static int __cpuinit cpu_numa_callback(struct notifier_block *nfb,
435 unsigned long action,
438 unsigned long lcpu = (unsigned long)hcpu;
439 int ret = NOTIFY_DONE;
443 case CPU_UP_PREPARE_FROZEN:
444 numa_setup_cpu(lcpu);
447 #ifdef CONFIG_HOTPLUG_CPU
449 case CPU_DEAD_FROZEN:
450 case CPU_UP_CANCELED:
451 case CPU_UP_CANCELED_FROZEN:
452 unmap_cpu_from_node(lcpu);
461 * Check and possibly modify a memory region to enforce the memory limit.
463 * Returns the size the region should have to enforce the memory limit.
464 * This will either be the original value of size, a truncated value,
465 * or zero. If the returned value of size is 0 the region should be
466 * discarded as it lies wholy above the memory limit.
468 static unsigned long __init numa_enforce_memory_limit(unsigned long start,
472 * We use lmb_end_of_DRAM() in here instead of memory_limit because
473 * we've already adjusted it for the limit and it takes care of
474 * having memory holes below the limit.
480 if (start + size <= lmb_end_of_DRAM())
483 if (start >= lmb_end_of_DRAM())
486 return lmb_end_of_DRAM() - start;
490 * Extract NUMA information from the ibm,dynamic-reconfiguration-memory
491 * node. This assumes n_mem_{addr,size}_cells have been set.
493 static void __init parse_drconf_memory(struct device_node *memory)
497 unsigned long lmb_size, size;
499 struct assoc_arrays aa;
501 n = of_get_drconf_memory(memory, &dm);
505 lmb_size = of_get_lmb_size(memory);
509 rc = of_get_assoc_arrays(memory, &aa);
513 for (; n != 0; --n) {
514 struct of_drconf_cell drmem;
516 read_drconf_cell(&drmem, &dm);
518 /* skip this block if the reserved bit is set in flags (0x80)
519 or if the block is not assigned to this partition (0x8) */
520 if ((drmem.flags & DRCONF_MEM_RESERVED)
521 || !(drmem.flags & DRCONF_MEM_ASSIGNED))
524 nid = of_drconf_to_nid_single(&drmem, &aa);
526 fake_numa_create_new_node(
527 ((drmem.base_addr + lmb_size) >> PAGE_SHIFT),
530 node_set_online(nid);
532 size = numa_enforce_memory_limit(drmem.base_addr, lmb_size);
536 add_active_range(nid, drmem.base_addr >> PAGE_SHIFT,
537 (drmem.base_addr >> PAGE_SHIFT)
538 + (size >> PAGE_SHIFT));
542 static int __init parse_numa_properties(void)
544 struct device_node *cpu = NULL;
545 struct device_node *memory = NULL;
549 if (numa_enabled == 0) {
550 printk(KERN_WARNING "NUMA disabled by user\n");
554 min_common_depth = find_min_common_depth();
556 if (min_common_depth < 0)
557 return min_common_depth;
559 dbg("NUMA associativity depth for CPU/Memory: %d\n", min_common_depth);
562 * Even though we connect cpus to numa domains later in SMP
563 * init, we need to know the node ids now. This is because
564 * each node to be onlined must have NODE_DATA etc backing it.
566 for_each_present_cpu(i) {
569 cpu = find_cpu_node(i);
571 nid = of_node_to_nid_single(cpu);
575 * Don't fall back to default_nid yet -- we will plug
576 * cpus into nodes once the memory scan has discovered
581 node_set_online(nid);
584 get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);
586 while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
591 const unsigned int *memcell_buf;
594 memcell_buf = of_get_property(memory,
595 "linux,usable-memory", &len);
596 if (!memcell_buf || len <= 0)
597 memcell_buf = of_get_property(memory, "reg", &len);
598 if (!memcell_buf || len <= 0)
602 ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
604 /* these are order-sensitive, and modify the buffer pointer */
605 start = read_n_cells(n_mem_addr_cells, &memcell_buf);
606 size = read_n_cells(n_mem_size_cells, &memcell_buf);
609 * Assumption: either all memory nodes or none will
610 * have associativity properties. If none, then
611 * everything goes to default_nid.
613 nid = of_node_to_nid_single(memory);
617 fake_numa_create_new_node(((start + size) >> PAGE_SHIFT), &nid);
618 node_set_online(nid);
620 if (!(size = numa_enforce_memory_limit(start, size))) {
627 add_active_range(nid, start >> PAGE_SHIFT,
628 (start >> PAGE_SHIFT) + (size >> PAGE_SHIFT));
635 * Now do the same thing for each LMB listed in the ibm,dynamic-memory
636 * property in the ibm,dynamic-reconfiguration-memory node.
638 memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
640 parse_drconf_memory(memory);
645 static void __init setup_nonnuma(void)
647 unsigned long top_of_ram = lmb_end_of_DRAM();
648 unsigned long total_ram = lmb_phys_mem_size();
649 unsigned long start_pfn, end_pfn;
650 unsigned int i, nid = 0;
652 printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
653 top_of_ram, total_ram);
654 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
655 (top_of_ram - total_ram) >> 20);
657 for (i = 0; i < lmb.memory.cnt; ++i) {
658 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
659 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
661 fake_numa_create_new_node(end_pfn, &nid);
662 add_active_range(nid, start_pfn, end_pfn);
663 node_set_online(nid);
667 void __init dump_numa_cpu_topology(void)
670 unsigned int cpu, count;
672 if (min_common_depth == -1 || !numa_enabled)
675 for_each_online_node(node) {
676 printk(KERN_DEBUG "Node %d CPUs:", node);
680 * If we used a CPU iterator here we would miss printing
681 * the holes in the cpumap.
683 for (cpu = 0; cpu < NR_CPUS; cpu++) {
684 if (cpu_isset(cpu, numa_cpumask_lookup_table[node])) {
690 printk("-%u", cpu - 1);
696 printk("-%u", NR_CPUS - 1);
701 static void __init dump_numa_memory_topology(void)
706 if (min_common_depth == -1 || !numa_enabled)
709 for_each_online_node(node) {
712 printk(KERN_DEBUG "Node %d Memory:", node);
716 for (i = 0; i < lmb_end_of_DRAM();
717 i += (1 << SECTION_SIZE_BITS)) {
718 if (early_pfn_to_nid(i >> PAGE_SHIFT) == node) {
736 * Allocate some memory, satisfying the lmb or bootmem allocator where
737 * required. nid is the preferred node and end is the physical address of
738 * the highest address in the node.
740 * Returns the physical address of the memory.
742 static void __init *careful_allocation(int nid, unsigned long size,
744 unsigned long end_pfn)
747 unsigned long ret = __lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
749 /* retry over all memory */
751 ret = __lmb_alloc_base(size, align, lmb_end_of_DRAM());
754 panic("numa.c: cannot allocate %lu bytes on node %d",
758 * If the memory came from a previously allocated node, we must
759 * retry with the bootmem allocator.
761 new_nid = early_pfn_to_nid(ret >> PAGE_SHIFT);
763 ret = (unsigned long)__alloc_bootmem_node(NODE_DATA(new_nid),
767 panic("numa.c: cannot allocate %lu bytes on node %d",
772 dbg("alloc_bootmem %lx %lx\n", ret, size);
778 static struct notifier_block __cpuinitdata ppc64_numa_nb = {
779 .notifier_call = cpu_numa_callback,
780 .priority = 1 /* Must run before sched domains notifier. */
783 void __init do_init_bootmem(void)
789 max_low_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
790 max_pfn = max_low_pfn;
792 if (parse_numa_properties())
795 dump_numa_memory_topology();
797 register_cpu_notifier(&ppc64_numa_nb);
798 cpu_numa_callback(&ppc64_numa_nb, CPU_UP_PREPARE,
799 (void *)(unsigned long)boot_cpuid);
801 for_each_online_node(nid) {
802 unsigned long start_pfn, end_pfn;
803 unsigned long bootmem_paddr;
804 unsigned long bootmap_pages;
806 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
808 /* Allocate the node structure node local if possible */
809 NODE_DATA(nid) = careful_allocation(nid,
810 sizeof(struct pglist_data),
811 SMP_CACHE_BYTES, end_pfn);
812 NODE_DATA(nid) = __va(NODE_DATA(nid));
813 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
815 dbg("node %d\n", nid);
816 dbg("NODE_DATA() = %p\n", NODE_DATA(nid));
818 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
819 NODE_DATA(nid)->node_start_pfn = start_pfn;
820 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
822 if (NODE_DATA(nid)->node_spanned_pages == 0)
825 dbg("start_paddr = %lx\n", start_pfn << PAGE_SHIFT);
826 dbg("end_paddr = %lx\n", end_pfn << PAGE_SHIFT);
828 bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
829 bootmem_paddr = (unsigned long)careful_allocation(nid,
830 bootmap_pages << PAGE_SHIFT,
832 memset(__va(bootmem_paddr), 0, bootmap_pages << PAGE_SHIFT);
834 dbg("bootmap_paddr = %lx\n", bootmem_paddr);
836 init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
839 free_bootmem_with_active_regions(nid, end_pfn);
841 /* Mark reserved regions on this node */
842 for (i = 0; i < lmb.reserved.cnt; i++) {
843 unsigned long physbase = lmb.reserved.region[i].base;
844 unsigned long size = lmb.reserved.region[i].size;
845 unsigned long start_paddr = start_pfn << PAGE_SHIFT;
846 unsigned long end_paddr = end_pfn << PAGE_SHIFT;
848 if (early_pfn_to_nid(physbase >> PAGE_SHIFT) != nid &&
849 early_pfn_to_nid((physbase+size-1) >> PAGE_SHIFT) != nid)
852 if (physbase < end_paddr &&
853 (physbase+size) > start_paddr) {
855 if (physbase < start_paddr) {
856 size -= start_paddr - physbase;
857 physbase = start_paddr;
860 if (size > end_paddr - physbase)
861 size = end_paddr - physbase;
863 dbg("reserve_bootmem %lx %lx\n", physbase,
865 reserve_bootmem_node(NODE_DATA(nid), physbase,
866 size, BOOTMEM_DEFAULT);
870 sparse_memory_present_with_active_regions(nid);
874 void __init paging_init(void)
876 unsigned long max_zone_pfns[MAX_NR_ZONES];
877 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
878 max_zone_pfns[ZONE_DMA] = lmb_end_of_DRAM() >> PAGE_SHIFT;
879 free_area_init_nodes(max_zone_pfns);
882 static int __init early_numa(char *p)
887 if (strstr(p, "off"))
890 if (strstr(p, "debug"))
893 p = strstr(p, "fake=");
895 cmdline = p + strlen("fake=");
899 early_param("numa", early_numa);
901 #ifdef CONFIG_MEMORY_HOTPLUG
903 * Validate the node associated with the memory section we are
906 int valid_hot_add_scn(int *nid, unsigned long start, u32 lmb_size,
907 unsigned long scn_addr)
911 if (*nid < 0 || !node_online(*nid))
912 *nid = any_online_node(NODE_MASK_ALL);
914 if ((scn_addr >= start) && (scn_addr < (start + lmb_size))) {
916 while (NODE_DATA(*nid)->node_spanned_pages == 0) {
917 node_clear(*nid, nodes);
918 *nid = any_online_node(nodes);
928 * Find the node associated with a hot added memory section represented
929 * by the ibm,dynamic-reconfiguration-memory node.
931 static int hot_add_drconf_scn_to_nid(struct device_node *memory,
932 unsigned long scn_addr)
936 unsigned long lmb_size;
937 int default_nid = any_online_node(NODE_MASK_ALL);
939 struct assoc_arrays aa;
941 n = of_get_drconf_memory(memory, &dm);
945 lmb_size = of_get_lmb_size(memory);
949 rc = of_get_assoc_arrays(memory, &aa);
953 for (; n != 0; --n) {
954 struct of_drconf_cell drmem;
956 read_drconf_cell(&drmem, &dm);
958 /* skip this block if it is reserved or not assigned to
960 if ((drmem.flags & DRCONF_MEM_RESERVED)
961 || !(drmem.flags & DRCONF_MEM_ASSIGNED))
964 nid = of_drconf_to_nid_single(&drmem, &aa);
966 if (valid_hot_add_scn(&nid, drmem.base_addr, lmb_size,
971 BUG(); /* section address should be found above */
976 * Find the node associated with a hot added memory section. Section
977 * corresponds to a SPARSEMEM section, not an LMB. It is assumed that
978 * sections are fully contained within a single LMB.
980 int hot_add_scn_to_nid(unsigned long scn_addr)
982 struct device_node *memory = NULL;
985 if (!numa_enabled || (min_common_depth < 0))
986 return any_online_node(NODE_MASK_ALL);
988 memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
990 nid = hot_add_drconf_scn_to_nid(memory, scn_addr);
995 while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
996 unsigned long start, size;
998 const unsigned int *memcell_buf;
1001 memcell_buf = of_get_property(memory, "reg", &len);
1002 if (!memcell_buf || len <= 0)
1005 /* ranges in cell */
1006 ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
1008 start = read_n_cells(n_mem_addr_cells, &memcell_buf);
1009 size = read_n_cells(n_mem_size_cells, &memcell_buf);
1010 nid = of_node_to_nid_single(memory);
1012 if (valid_hot_add_scn(&nid, start, size, scn_addr)) {
1013 of_node_put(memory);
1017 if (--ranges) /* process all ranges in cell */
1020 BUG(); /* section address should be found above */
1023 #endif /* CONFIG_MEMORY_HOTPLUG */