1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_NUMA_H
3#define _LINUX_NUMA_H
4#include <linux/types.h>
5
6#ifdef CONFIG_NODES_SHIFT
7#define NODES_SHIFT CONFIG_NODES_SHIFT
8#else
9#define NODES_SHIFT 0
10#endif
11
12#define MAX_NUMNODES (1 << NODES_SHIFT)
13
14#define NUMA_NO_NODE (-1)
15
16/* optionally keep NUMA memory info available post init */
17#ifdef CONFIG_NUMA_KEEP_MEMINFO
18#define __initdata_or_meminfo
19#else
20#define __initdata_or_meminfo __initdata
21#endif
22
23#ifdef CONFIG_NUMA
24#include <linux/printk.h>
25#include <asm/sparsemem.h>
26
27/* Generic implementation available */
28int numa_map_to_online_node(int node);
29
30#ifndef memory_add_physaddr_to_nid
31static inline int memory_add_physaddr_to_nid(u64 start)
32{
33 pr_info_once("Unknown online node for memory at 0x%llx, assuming node 0\n",
34 start);
35 return 0;
36}
37#endif
38#ifndef phys_to_target_node
39static inline int phys_to_target_node(u64 start)
40{
41 pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
42 start);
43 return 0;
44}
45#endif
46#else /* !CONFIG_NUMA */
47static inline int numa_map_to_online_node(int node)
48{
49 return NUMA_NO_NODE;
50}
51static inline int memory_add_physaddr_to_nid(u64 start)
52{
53 return 0;
54}
55static inline int phys_to_target_node(u64 start)
56{
57 return 0;
58}
59#endif
60
61#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
62extern const struct attribute_group arch_node_dev_group;
63#endif
64
65#endif /* _LINUX_NUMA_H */
66

source code of linux/include/linux/numa.h