numa.h

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_NUMA_H
#define _LINUX_NUMA_H
#include <linux/init.h>
#include <linux/types.h>
#include <linux/nodemask.h>
 
#define NUMA_NO_MEMBLK  (-1)
 
static inline bool numa_valid_node(int nid)
{
    return nid >= 0 && nid < MAX_NUMNODES;
}
 
/* optionally keep NUMA memory info available post init */
#ifdef CONFIG_NUMA_KEEP_MEMINFO
#define __initdata_or_meminfo
#else
#define __initdata_or_meminfo __initdata
#endif
 
#ifdef CONFIG_NUMA
#include <asm/sparsemem.h>
 
extern struct pglist_data *node_data[];
#define NODE_DATA(nid)  (node_data[nid])
 
void __init alloc_node_data(int nid);
void __init alloc_offline_node_data(int nid);
 
/* Generic implementation available */
int numa_nearest_node(int node, unsigned int state);
 
int nearest_node_nodemask(int node, nodemask_t *mask);
 
#ifndef memory_add_physaddr_to_nid
int memory_add_physaddr_to_nid(u64 start);
#endif
 
#ifndef phys_to_target_node
int phys_to_target_node(u64 start);
#endif
 
int numa_fill_memblks(u64 start, u64 end);
 
#else /* !CONFIG_NUMA */
static inline int numa_nearest_node(int node, unsigned int state)
{
    return NUMA_NO_NODE;
}
 
static inline int nearest_node_nodemask(int node, nodemask_t *mask)
{
    return NUMA_NO_NODE;
}
 
static inline int memory_add_physaddr_to_nid(u64 start)
{
    return 0;
}
static inline int phys_to_target_node(u64 start)
{
    return 0;
}
 
static inline void alloc_offline_node_data(int nid) {}
#endif
 
#define numa_map_to_online_node(node) numa_nearest_node(node, N_ONLINE)
 
#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
extern const struct attribute_group arch_node_dev_group;
#endif
 
#endif /* _LINUX_NUMA_H */