1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Common code for 32 and 64-bit NUMA */
3 #include <linux/acpi.h>
4 #include <linux/kernel.h>
6 #include <linux/string.h>
7 #include <linux/init.h>
8 #include <linux/memblock.h>
9 #include <linux/mmzone.h>
10 #include <linux/ctype.h>
11 #include <linux/nodemask.h>
12 #include <linux/sched.h>
13 #include <linux/topology.h>
15 #include <asm/e820/api.h>
16 #include <asm/proto.h>
18 #include <asm/amd_nb.h>
20 #include "numa_internal.h"
23 nodemask_t numa_nodes_parsed __initdata;
25 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
26 EXPORT_SYMBOL(node_data);
28 static struct numa_meminfo numa_meminfo
29 #ifndef CONFIG_MEMORY_HOTPLUG
34 static int numa_distance_cnt;
35 static u8 *numa_distance;
37 static __init int numa_setup(char *opt)
41 if (!strncmp(opt, "off", 3))
43 #ifdef CONFIG_NUMA_EMU
44 if (!strncmp(opt, "fake=", 5))
45 numa_emu_cmdline(opt + 5);
47 #ifdef CONFIG_ACPI_NUMA
48 if (!strncmp(opt, "noacpi", 6))
53 early_param("numa", numa_setup);
56 * apicid, cpu, node mappings
58 s16 __apicid_to_node[MAX_LOCAL_APIC] = {
59 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
62 int numa_cpu_node(int cpu)
64 int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
66 if (apicid != BAD_APICID)
67 return __apicid_to_node[apicid];
71 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
72 EXPORT_SYMBOL(node_to_cpumask_map);
75 * Map cpu index to node index
77 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
78 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
80 void numa_set_node(int cpu, int node)
82 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
84 /* early setting, no percpu area yet */
85 if (cpu_to_node_map) {
86 cpu_to_node_map[cpu] = node;
90 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
91 if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
92 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
97 per_cpu(x86_cpu_to_node_map, cpu) = node;
99 set_cpu_numa_node(cpu, node);
102 void numa_clear_node(int cpu)
104 numa_set_node(cpu, NUMA_NO_NODE);
108 * Allocate node_to_cpumask_map based on number of available nodes
109 * Requires node_possible_map to be valid.
111 * Note: cpumask_of_node() is not valid until after this is done.
112 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
114 void __init setup_node_to_cpumask_map(void)
118 /* setup nr_node_ids if not done yet */
119 if (nr_node_ids == MAX_NUMNODES)
122 /* allocate the map */
123 for (node = 0; node < nr_node_ids; node++)
124 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
126 /* cpumask_of_node() will now work */
127 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
130 static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
131 struct numa_meminfo *mi)
133 /* ignore zero length blks */
137 /* whine about and ignore invalid blks */
138 if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
139 pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
140 nid, start, end - 1);
144 if (mi->nr_blks >= NR_NODE_MEMBLKS) {
145 pr_err("too many memblk ranges\n");
149 mi->blk[mi->nr_blks].start = start;
150 mi->blk[mi->nr_blks].end = end;
151 mi->blk[mi->nr_blks].nid = nid;
157 * numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo
158 * @idx: Index of memblk to remove
159 * @mi: numa_meminfo to remove memblk from
161 * Remove @idx'th numa_memblk from @mi by shifting @mi->blk[] and
162 * decrementing @mi->nr_blks.
164 void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
167 memmove(&mi->blk[idx], &mi->blk[idx + 1],
168 (mi->nr_blks - idx) * sizeof(mi->blk[0]));
172 * numa_add_memblk - Add one numa_memblk to numa_meminfo
173 * @nid: NUMA node ID of the new memblk
174 * @start: Start address of the new memblk
175 * @end: End address of the new memblk
177 * Add a new memblk to the default numa_meminfo.
180 * 0 on success, -errno on failure.
182 int __init numa_add_memblk(int nid, u64 start, u64 end)
184 return numa_add_memblk_to(nid, start, end, &numa_meminfo);
187 /* Allocate NODE_DATA for a node on the local memory */
188 static void __init alloc_node_data(int nid)
190 const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
196 * Allocate node data. Try node-local memory and then any node.
197 * Never allocate in DMA zone.
199 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
201 pr_err("Cannot find %zu bytes in any node (initial node: %d)\n",
207 /* report and initialize */
208 printk(KERN_INFO "NODE_DATA(%d) allocated [mem %#010Lx-%#010Lx]\n", nid,
209 nd_pa, nd_pa + nd_size - 1);
210 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
212 printk(KERN_INFO " NODE_DATA(%d) on node %d\n", nid, tnid);
215 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
217 node_set_online(nid);
221 * numa_cleanup_meminfo - Cleanup a numa_meminfo
222 * @mi: numa_meminfo to clean up
224 * Sanitize @mi by merging and removing unnecessary memblks. Also check for
225 * conflicts and clear unused memblks.
228 * 0 on success, -errno on failure.
230 int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
233 const u64 high = PFN_PHYS(max_pfn);
236 /* first, trim all entries */
237 for (i = 0; i < mi->nr_blks; i++) {
238 struct numa_memblk *bi = &mi->blk[i];
240 /* make sure all blocks are inside the limits */
241 bi->start = max(bi->start, low);
242 bi->end = min(bi->end, high);
244 /* and there's no empty or non-exist block */
245 if (bi->start >= bi->end ||
246 !memblock_overlaps_region(&memblock.memory,
247 bi->start, bi->end - bi->start))
248 numa_remove_memblk_from(i--, mi);
251 /* merge neighboring / overlapping entries */
252 for (i = 0; i < mi->nr_blks; i++) {
253 struct numa_memblk *bi = &mi->blk[i];
255 for (j = i + 1; j < mi->nr_blks; j++) {
256 struct numa_memblk *bj = &mi->blk[j];
260 * See whether there are overlapping blocks. Whine
261 * about but allow overlaps of the same nid. They
262 * will be merged below.
264 if (bi->end > bj->start && bi->start < bj->end) {
265 if (bi->nid != bj->nid) {
266 pr_err("node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
267 bi->nid, bi->start, bi->end - 1,
268 bj->nid, bj->start, bj->end - 1);
271 pr_warn("Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
272 bi->nid, bi->start, bi->end - 1,
273 bj->start, bj->end - 1);
277 * Join together blocks on the same node, holes
278 * between which don't overlap with memory on other
281 if (bi->nid != bj->nid)
283 start = min(bi->start, bj->start);
284 end = max(bi->end, bj->end);
285 for (k = 0; k < mi->nr_blks; k++) {
286 struct numa_memblk *bk = &mi->blk[k];
288 if (bi->nid == bk->nid)
290 if (start < bk->end && end > bk->start)
295 printk(KERN_INFO "NUMA: Node %d [mem %#010Lx-%#010Lx] + [mem %#010Lx-%#010Lx] -> [mem %#010Lx-%#010Lx]\n",
296 bi->nid, bi->start, bi->end - 1, bj->start,
297 bj->end - 1, start, end - 1);
300 numa_remove_memblk_from(j--, mi);
304 /* clear unused ones */
305 for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
306 mi->blk[i].start = mi->blk[i].end = 0;
307 mi->blk[i].nid = NUMA_NO_NODE;
314 * Set nodes, which have memory in @mi, in *@nodemask.
316 static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
317 const struct numa_meminfo *mi)
321 for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
322 if (mi->blk[i].start != mi->blk[i].end &&
323 mi->blk[i].nid != NUMA_NO_NODE)
324 node_set(mi->blk[i].nid, *nodemask);
328 * numa_reset_distance - Reset NUMA distance table
330 * The current table is freed. The next numa_set_distance() call will
333 void __init numa_reset_distance(void)
335 size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
337 /* numa_distance could be 1LU marking allocation failure, test cnt */
338 if (numa_distance_cnt)
339 memblock_free(__pa(numa_distance), size);
340 numa_distance_cnt = 0;
341 numa_distance = NULL; /* enable table creation */
344 static int __init numa_alloc_distance(void)
346 nodemask_t nodes_parsed;
351 /* size the new table and allocate it */
352 nodes_parsed = numa_nodes_parsed;
353 numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
355 for_each_node_mask(i, nodes_parsed)
358 size = cnt * cnt * sizeof(numa_distance[0]);
360 phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
363 pr_warn("Warning: can't allocate distance table!\n");
364 /* don't retry until explicitly reset */
365 numa_distance = (void *)1LU;
368 memblock_reserve(phys, size);
370 numa_distance = __va(phys);
371 numa_distance_cnt = cnt;
373 /* fill with the default distances */
374 for (i = 0; i < cnt; i++)
375 for (j = 0; j < cnt; j++)
376 numa_distance[i * cnt + j] = i == j ?
377 LOCAL_DISTANCE : REMOTE_DISTANCE;
378 printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
384 * numa_set_distance - Set NUMA distance from one NUMA to another
385 * @from: the 'from' node to set distance
386 * @to: the 'to' node to set distance
387 * @distance: NUMA distance
389 * Set the distance from node @from to @to to @distance. If distance table
390 * doesn't exist, one which is large enough to accommodate all the currently
391 * known nodes will be created.
393 * If such table cannot be allocated, a warning is printed and further
394 * calls are ignored until the distance table is reset with
395 * numa_reset_distance().
397 * If @from or @to is higher than the highest known node or lower than zero
398 * at the time of table creation or @distance doesn't make sense, the call
400 * This is to allow simplification of specific NUMA config implementations.
402 void __init numa_set_distance(int from, int to, int distance)
404 if (!numa_distance && numa_alloc_distance() < 0)
407 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
408 from < 0 || to < 0) {
409 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
414 if ((u8)distance != distance ||
415 (from == to && distance != LOCAL_DISTANCE)) {
416 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
421 numa_distance[from * numa_distance_cnt + to] = distance;
424 int __node_distance(int from, int to)
426 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
427 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
428 return numa_distance[from * numa_distance_cnt + to];
430 EXPORT_SYMBOL(__node_distance);
433 * Sanity check to catch more bad NUMA configurations (they are amazingly
434 * common). Make sure the nodes cover all memory.
436 static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
438 u64 numaram, e820ram;
442 for (i = 0; i < mi->nr_blks; i++) {
443 u64 s = mi->blk[i].start >> PAGE_SHIFT;
444 u64 e = mi->blk[i].end >> PAGE_SHIFT;
446 numaram -= __absent_pages_in_range(mi->blk[i].nid, s, e);
447 if ((s64)numaram < 0)
451 e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
453 /* We seem to lose 3 pages somewhere. Allow 1M of slack. */
454 if ((s64)(e820ram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
455 printk(KERN_ERR "NUMA: nodes only cover %LuMB of your %LuMB e820 RAM. Not used.\n",
456 (numaram << PAGE_SHIFT) >> 20,
457 (e820ram << PAGE_SHIFT) >> 20);
464 * Mark all currently memblock-reserved physical memory (which covers the
465 * kernel's own memory ranges) as hot-unswappable.
467 static void __init numa_clear_kernel_node_hotplug(void)
469 nodemask_t reserved_nodemask = NODE_MASK_NONE;
470 struct memblock_region *mb_region;
474 * We have to do some preprocessing of memblock regions, to
475 * make them suitable for reservation.
477 * At this time, all memory regions reserved by memblock are
478 * used by the kernel, but those regions are not split up
479 * along node boundaries yet, and don't necessarily have their
480 * node ID set yet either.
482 * So iterate over all memory known to the x86 architecture,
483 * and use those ranges to set the nid in memblock.reserved.
484 * This will split up the memblock regions along node
485 * boundaries and will set the node IDs as well.
487 for (i = 0; i < numa_meminfo.nr_blks; i++) {
488 struct numa_memblk *mb = numa_meminfo.blk + i;
491 ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
496 * Now go over all reserved memblock regions, to construct a
497 * node mask of all kernel reserved memory areas.
499 * [ Note, when booting with mem=nn[kMG] or in a kdump kernel,
500 * numa_meminfo might not include all memblock.reserved
501 * memory ranges, because quirks such as trim_snb_memory()
502 * reserve specific pages for Sandy Bridge graphics. ]
504 for_each_memblock(reserved, mb_region) {
505 if (mb_region->nid != MAX_NUMNODES)
506 node_set(mb_region->nid, reserved_nodemask);
510 * Finally, clear the MEMBLOCK_HOTPLUG flag for all memory
511 * belonging to the reserved node mask.
513 * Note that this will include memory regions that reside
514 * on nodes that contain kernel memory - entire nodes
515 * become hot-unpluggable:
517 for (i = 0; i < numa_meminfo.nr_blks; i++) {
518 struct numa_memblk *mb = numa_meminfo.blk + i;
520 if (!node_isset(mb->nid, reserved_nodemask))
523 memblock_clear_hotplug(mb->start, mb->end - mb->start);
527 static int __init numa_register_memblks(struct numa_meminfo *mi)
529 unsigned long uninitialized_var(pfn_align);
532 /* Account for nodes with cpus and no memory */
533 node_possible_map = numa_nodes_parsed;
534 numa_nodemask_from_meminfo(&node_possible_map, mi);
535 if (WARN_ON(nodes_empty(node_possible_map)))
538 for (i = 0; i < mi->nr_blks; i++) {
539 struct numa_memblk *mb = &mi->blk[i];
540 memblock_set_node(mb->start, mb->end - mb->start,
541 &memblock.memory, mb->nid);
545 * At very early time, the kernel have to use some memory such as
546 * loading the kernel image. We cannot prevent this anyway. So any
547 * node the kernel resides in should be un-hotpluggable.
549 * And when we come here, alloc node data won't fail.
551 numa_clear_kernel_node_hotplug();
554 * If sections array is gonna be used for pfn -> nid mapping, check
555 * whether its granularity is fine enough.
557 #ifdef NODE_NOT_IN_PAGE_FLAGS
558 pfn_align = node_map_pfn_alignment();
559 if (pfn_align && pfn_align < PAGES_PER_SECTION) {
560 printk(KERN_WARNING "Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
561 PFN_PHYS(pfn_align) >> 20,
562 PFN_PHYS(PAGES_PER_SECTION) >> 20);
566 if (!numa_meminfo_cover_memory(mi))
569 /* Finally register nodes. */
570 for_each_node_mask(nid, node_possible_map) {
571 u64 start = PFN_PHYS(max_pfn);
574 for (i = 0; i < mi->nr_blks; i++) {
575 if (nid != mi->blk[i].nid)
577 start = min(mi->blk[i].start, start);
578 end = max(mi->blk[i].end, end);
585 * Don't confuse VM with a node that doesn't have the
586 * minimum amount of memory:
588 if (end && (end - start) < NODE_MIN_SIZE)
591 alloc_node_data(nid);
594 /* Dump memblock with node info and return. */
600 * There are unfortunately some poorly designed mainboards around that
601 * only connect memory to a single CPU. This breaks the 1:1 cpu->node
602 * mapping. To avoid this fill in the mapping for all possible CPUs,
603 * as the number of CPUs is not known yet. We round robin the existing
606 static void __init numa_init_array(void)
610 rr = first_node(node_online_map);
611 for (i = 0; i < nr_cpu_ids; i++) {
612 if (early_cpu_to_node(i) != NUMA_NO_NODE)
614 numa_set_node(i, rr);
615 rr = next_node_in(rr, node_online_map);
619 static int __init numa_init(int (*init_func)(void))
624 for (i = 0; i < MAX_LOCAL_APIC; i++)
625 set_apicid_to_node(i, NUMA_NO_NODE);
627 nodes_clear(numa_nodes_parsed);
628 nodes_clear(node_possible_map);
629 nodes_clear(node_online_map);
630 memset(&numa_meminfo, 0, sizeof(numa_meminfo));
631 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
633 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.reserved,
635 /* In case that parsing SRAT failed. */
636 WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
637 numa_reset_distance();
644 * We reset memblock back to the top-down direction
645 * here because if we configured ACPI_NUMA, we have
646 * parsed SRAT in init_func(). It is ok to have the
647 * reset here even if we did't configure ACPI_NUMA
648 * or acpi numa init fails and fallbacks to dummy
651 memblock_set_bottom_up(false);
653 ret = numa_cleanup_meminfo(&numa_meminfo);
657 numa_emulation(&numa_meminfo, numa_distance_cnt);
659 ret = numa_register_memblks(&numa_meminfo);
663 for (i = 0; i < nr_cpu_ids; i++) {
664 int nid = early_cpu_to_node(i);
666 if (nid == NUMA_NO_NODE)
668 if (!node_online(nid))
677 * dummy_numa_init - Fallback dummy NUMA init
679 * Used if there's no underlying NUMA architecture, NUMA initialization
680 * fails, or NUMA is disabled on the command line.
682 * Must online at least one node and add memory blocks that cover all
683 * allowed memory. This function must not fail.
685 static int __init dummy_numa_init(void)
687 printk(KERN_INFO "%s\n",
688 numa_off ? "NUMA turned off" : "No NUMA configuration found");
689 printk(KERN_INFO "Faking a node at [mem %#018Lx-%#018Lx]\n",
690 0LLU, PFN_PHYS(max_pfn) - 1);
692 node_set(0, numa_nodes_parsed);
693 numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
699 * x86_numa_init - Initialize NUMA
701 * Try each configured NUMA initialization method until one succeeds. The
702 * last fallback is dummy single node config encomapssing whole memory and
705 void __init x86_numa_init(void)
708 #ifdef CONFIG_ACPI_NUMA
709 if (!numa_init(x86_acpi_numa_init))
712 #ifdef CONFIG_AMD_NUMA
713 if (!numa_init(amd_numa_init))
718 numa_init(dummy_numa_init);
721 static void __init init_memory_less_node(int nid)
723 unsigned long zones_size[MAX_NR_ZONES] = {0};
724 unsigned long zholes_size[MAX_NR_ZONES] = {0};
726 /* Allocate and initialize node data. Memory-less node is now online.*/
727 alloc_node_data(nid);
728 free_area_init_node(nid, zones_size, 0, zholes_size);
731 * All zonelists will be built later in start_kernel() after per cpu
732 * areas are initialized.
737 * Setup early cpu_to_node.
739 * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
740 * and apicid_to_node[] tables have valid entries for a CPU.
741 * This means we skip cpu_to_node[] initialisation for NUMA
742 * emulation and faking node case (when running a kernel compiled
743 * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
744 * is already initialized in a round robin manner at numa_init_array,
745 * prior to this call, and this initialization is good enough
746 * for the fake NUMA cases.
748 * Called before the per_cpu areas are setup.
750 void __init init_cpu_to_node(void)
753 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
755 BUG_ON(cpu_to_apicid == NULL);
757 for_each_possible_cpu(cpu) {
758 int node = numa_cpu_node(cpu);
760 if (node == NUMA_NO_NODE)
763 if (!node_online(node))
764 init_memory_less_node(node);
766 numa_set_node(cpu, node);
770 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
772 # ifndef CONFIG_NUMA_EMU
773 void numa_add_cpu(int cpu)
775 cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
778 void numa_remove_cpu(int cpu)
780 cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
782 # endif /* !CONFIG_NUMA_EMU */
784 #else /* !CONFIG_DEBUG_PER_CPU_MAPS */
786 int __cpu_to_node(int cpu)
788 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
790 "cpu_to_node(%d): usage too early!\n", cpu);
792 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
794 return per_cpu(x86_cpu_to_node_map, cpu);
796 EXPORT_SYMBOL(__cpu_to_node);
799 * Same function as cpu_to_node() but used if called before the
800 * per_cpu areas are setup.
802 int early_cpu_to_node(int cpu)
804 if (early_per_cpu_ptr(x86_cpu_to_node_map))
805 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
807 if (!cpu_possible(cpu)) {
809 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
813 return per_cpu(x86_cpu_to_node_map, cpu);
816 void debug_cpumask_set_cpu(int cpu, int node, bool enable)
818 struct cpumask *mask;
820 if (node == NUMA_NO_NODE) {
821 /* early_cpu_to_node() already emits a warning and trace */
824 mask = node_to_cpumask_map[node];
826 pr_err("node_to_cpumask_map[%i] NULL\n", node);
832 cpumask_set_cpu(cpu, mask);
834 cpumask_clear_cpu(cpu, mask);
836 printk(KERN_DEBUG "%s cpu %d node %d: mask now %*pbl\n",
837 enable ? "numa_add_cpu" : "numa_remove_cpu",
838 cpu, node, cpumask_pr_args(mask));
842 # ifndef CONFIG_NUMA_EMU
843 static void numa_set_cpumask(int cpu, bool enable)
845 debug_cpumask_set_cpu(cpu, early_cpu_to_node(cpu), enable);
848 void numa_add_cpu(int cpu)
850 numa_set_cpumask(cpu, true);
853 void numa_remove_cpu(int cpu)
855 numa_set_cpumask(cpu, false);
857 # endif /* !CONFIG_NUMA_EMU */
860 * Returns a pointer to the bitmask of CPUs on Node 'node'.
862 const struct cpumask *cpumask_of_node(int node)
864 if (node >= nr_node_ids) {
866 "cpumask_of_node(%d): node > nr_node_ids(%u)\n",
869 return cpu_none_mask;
871 if (node_to_cpumask_map[node] == NULL) {
873 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
876 return cpu_online_mask;
878 return node_to_cpumask_map[node];
880 EXPORT_SYMBOL(cpumask_of_node);
882 #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
884 #ifdef CONFIG_MEMORY_HOTPLUG
885 int memory_add_physaddr_to_nid(u64 start)
887 struct numa_meminfo *mi = &numa_meminfo;
888 int nid = mi->blk[0].nid;
891 for (i = 0; i < mi->nr_blks; i++)
892 if (mi->blk[i].start <= start && mi->blk[i].end > start)
893 nid = mi->blk[i].nid;
896 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);