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-rw-r--r--include/linux/percpu.h79
1 files changed, 60 insertions, 19 deletions
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index f926490a7d8b..3835a9642f13 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -1,9 +1,12 @@
1#ifndef __LINUX_PERCPU_H 1#ifndef __LINUX_PERCPU_H
2#define __LINUX_PERCPU_H 2#define __LINUX_PERCPU_H
3
3#include <linux/spinlock.h> /* For preempt_disable() */ 4#include <linux/spinlock.h> /* For preempt_disable() */
4#include <linux/slab.h> /* For kmalloc() */ 5#include <linux/slab.h> /* For kmalloc() */
5#include <linux/smp.h> 6#include <linux/smp.h>
6#include <linux/string.h> /* For memset() */ 7#include <linux/string.h> /* For memset() */
8#include <linux/cpumask.h>
9
7#include <asm/percpu.h> 10#include <asm/percpu.h>
8 11
9/* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */ 12/* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
@@ -27,39 +30,77 @@ struct percpu_data {
27 void *ptrs[NR_CPUS]; 30 void *ptrs[NR_CPUS];
28}; 31};
29 32
33#define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)
30/* 34/*
31 * Use this to get to a cpu's version of the per-cpu object allocated using 35 * Use this to get to a cpu's version of the per-cpu object dynamically
32 * alloc_percpu. Non-atomic access to the current CPU's version should 36 * allocated. Non-atomic access to the current CPU's version should
33 * probably be combined with get_cpu()/put_cpu(). 37 * probably be combined with get_cpu()/put_cpu().
34 */ 38 */
35#define per_cpu_ptr(ptr, cpu) \ 39#define percpu_ptr(ptr, cpu) \
36({ \ 40({ \
37 struct percpu_data *__p = (struct percpu_data *)~(unsigned long)(ptr); \ 41 struct percpu_data *__p = __percpu_disguise(ptr); \
38 (__typeof__(ptr))__p->ptrs[(cpu)]; \ 42 (__typeof__(ptr))__p->ptrs[(cpu)]; \
39}) 43})
40 44
41extern void *__alloc_percpu(size_t size); 45extern void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu);
42extern void free_percpu(const void *); 46extern void percpu_depopulate(void *__pdata, int cpu);
47extern int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
48 cpumask_t *mask);
49extern void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask);
50extern void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask);
51extern void percpu_free(void *__pdata);
43 52
44#else /* CONFIG_SMP */ 53#else /* CONFIG_SMP */
45 54
46#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); }) 55#define percpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
56
57static inline void percpu_depopulate(void *__pdata, int cpu)
58{
59}
60
61static inline void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask)
62{
63}
47 64
48static inline void *__alloc_percpu(size_t size) 65static inline void *percpu_populate(void *__pdata, size_t size, gfp_t gfp,
66 int cpu)
49{ 67{
50 void *ret = kmalloc(size, GFP_KERNEL); 68 return percpu_ptr(__pdata, cpu);
51 if (ret)
52 memset(ret, 0, size);
53 return ret;
54} 69}
55static inline void free_percpu(const void *ptr) 70
56{ 71static inline int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
57 kfree(ptr); 72 cpumask_t *mask)
73{
74 return 0;
75}
76
77static inline void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
78{
79 return kzalloc(size, gfp);
80}
81
82static inline void percpu_free(void *__pdata)
83{
84 kfree(__pdata);
58} 85}
59 86
60#endif /* CONFIG_SMP */ 87#endif /* CONFIG_SMP */
61 88
62/* Simple wrapper for the common case: zeros memory. */ 89#define percpu_populate_mask(__pdata, size, gfp, mask) \
63#define alloc_percpu(type) ((type *)(__alloc_percpu(sizeof(type)))) 90 __percpu_populate_mask((__pdata), (size), (gfp), &(mask))
91#define percpu_depopulate_mask(__pdata, mask) \
92 __percpu_depopulate_mask((__pdata), &(mask))
93#define percpu_alloc_mask(size, gfp, mask) \
94 __percpu_alloc_mask((size), (gfp), &(mask))
95
96#define percpu_alloc(size, gfp) percpu_alloc_mask((size), (gfp), cpu_online_map)
97
98/* (legacy) interface for use without CPU hotplug handling */
99
100#define __alloc_percpu(size) percpu_alloc_mask((size), GFP_KERNEL, \
101 cpu_possible_map)
102#define alloc_percpu(type) (type *)__alloc_percpu(sizeof(type))
103#define free_percpu(ptr) percpu_free((ptr))
104#define per_cpu_ptr(ptr, cpu) percpu_ptr((ptr), (cpu))
64 105
65#endif /* __LINUX_PERCPU_H */ 106#endif /* __LINUX_PERCPU_H */