include/linux/cpu_rmap.h

Source file repositories/reference/linux-study-clean/include/linux/cpu_rmap.h

File Facts

System
Linux kernel
Corpus path
include/linux/cpu_rmap.h
Extension
.h
Size
1793 bytes
Lines
68
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct cpu_rmap {
	struct kref	refcount;
	u16		size;
	void		**obj;
	struct {
		u16	index;
		u16	dist;
	}		near[];
};
#define CPU_RMAP_DIST_INF 0xffff

extern struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags);
extern void cpu_rmap_get(struct cpu_rmap *rmap);
extern int cpu_rmap_put(struct cpu_rmap *rmap);

extern int cpu_rmap_add(struct cpu_rmap *rmap, void *obj);
extern int cpu_rmap_update(struct cpu_rmap *rmap, u16 index,
			   const struct cpumask *affinity);

static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu)
{
	return rmap->near[cpu].index;
}

static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu)
{
	return rmap->obj[rmap->near[cpu].index];
}

/**
 * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs
 * @size: Number of objects to be mapped
 *
 * Must be called in process context.
 */
static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size)
{
	return alloc_cpu_rmap(size, GFP_KERNEL);
}
extern void free_irq_cpu_rmap(struct cpu_rmap *rmap);

int irq_cpu_rmap_remove(struct cpu_rmap *rmap, int irq);
extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq);

#endif /* __LINUX_CPU_RMAP_H */

Annotation

Implementation Notes