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-rw-r--r--include/linux/pcounter.h74
-rw-r--r--lib/Makefile1
-rw-r--r--lib/pcounter.c58
3 files changed, 0 insertions, 133 deletions
diff --git a/include/linux/pcounter.h b/include/linux/pcounter.h
deleted file mode 100644
index a82d9f2628ca..000000000000
--- a/include/linux/pcounter.h
+++ /dev/null
@@ -1,74 +0,0 @@
1#ifndef __LINUX_PCOUNTER_H
2#define __LINUX_PCOUNTER_H
3/*
4 * Using a dynamic percpu 'int' variable has a cost :
5 * 1) Extra dereference
6 * Current per_cpu_ptr() implementation uses an array per 'percpu variable'.
7 * 2) memory cost of NR_CPUS*(32+sizeof(void *)) instead of num_possible_cpus()*4
8 *
9 * This pcounter implementation is an abstraction to be able to use
10 * either a static or a dynamic per cpu variable.
11 * One dynamic per cpu variable gets a fast & cheap implementation, we can
12 * change pcounter implementation too.
13 */
14struct pcounter {
15#ifdef CONFIG_SMP
16 void (*add)(struct pcounter *self, int inc);
17 int (*getval)(const struct pcounter *self, int cpu);
18 int *per_cpu_values;
19#else
20 int val;
21#endif
22};
23
24#ifdef CONFIG_SMP
25#include <linux/percpu.h>
26
27#define DEFINE_PCOUNTER(NAME) \
28static DEFINE_PER_CPU(int, NAME##_pcounter_values); \
29static void NAME##_pcounter_add(struct pcounter *self, int val) \
30{ \
31 __get_cpu_var(NAME##_pcounter_values) += val; \
32} \
33static int NAME##_pcounter_getval(const struct pcounter *self, int cpu) \
34{ \
35 return per_cpu(NAME##_pcounter_values, cpu); \
36} \
37
38#define PCOUNTER_MEMBER_INITIALIZER(NAME, MEMBER) \
39 MEMBER = { \
40 .add = NAME##_pcounter_add, \
41 .getval = NAME##_pcounter_getval, \
42 }
43
44
45static inline void pcounter_add(struct pcounter *self, int inc)
46{
47 self->add(self, inc);
48}
49
50extern int pcounter_getval(const struct pcounter *self);
51extern int pcounter_alloc(struct pcounter *self);
52extern void pcounter_free(struct pcounter *self);
53
54
55#else /* CONFIG_SMP */
56
57static inline void pcounter_add(struct pcounter *self, int inc)
58{
59 self->val += inc;
60}
61
62static inline int pcounter_getval(const struct pcounter *self)
63{
64 return self->val;
65}
66
67#define DEFINE_PCOUNTER(NAME)
68#define PCOUNTER_MEMBER_INITIALIZER(NAME, MEMBER)
69#define pcounter_alloc(self) 0
70#define pcounter_free(self)
71
72#endif /* CONFIG_SMP */
73
74#endif /* __LINUX_PCOUNTER_H */
diff --git a/lib/Makefile b/lib/Makefile
index 23de261a4c83..4d059d469554 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -61,7 +61,6 @@ obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
61obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o 61obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o
62obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o 62obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o
63obj-$(CONFIG_SMP) += percpu_counter.o 63obj-$(CONFIG_SMP) += percpu_counter.o
64obj-$(CONFIG_SMP) += pcounter.o
65obj-$(CONFIG_AUDIT_GENERIC) += audit.o 64obj-$(CONFIG_AUDIT_GENERIC) += audit.o
66 65
67obj-$(CONFIG_SWIOTLB) += swiotlb.o 66obj-$(CONFIG_SWIOTLB) += swiotlb.o
diff --git a/lib/pcounter.c b/lib/pcounter.c
deleted file mode 100644
index 9b56807da93b..000000000000
--- a/lib/pcounter.c
+++ /dev/null
@@ -1,58 +0,0 @@
1/*
2 * Define default pcounter functions
3 * Note that often used pcounters use dedicated functions to get a speed increase.
4 * (see DEFINE_PCOUNTER/REF_PCOUNTER_MEMBER)
5 */
6
7#include <linux/module.h>
8#include <linux/pcounter.h>
9#include <linux/smp.h>
10#include <linux/cpumask.h>
11
12static void pcounter_dyn_add(struct pcounter *self, int inc)
13{
14 per_cpu_ptr(self->per_cpu_values, smp_processor_id())[0] += inc;
15}
16
17static int pcounter_dyn_getval(const struct pcounter *self, int cpu)
18{
19 return per_cpu_ptr(self->per_cpu_values, cpu)[0];
20}
21
22int pcounter_getval(const struct pcounter *self)
23{
24 int res = 0, cpu;
25
26 for_each_possible_cpu(cpu)
27 res += self->getval(self, cpu);
28
29 return res;
30}
31EXPORT_SYMBOL_GPL(pcounter_getval);
32
33int pcounter_alloc(struct pcounter *self)
34{
35 int rc = 0;
36 if (self->add == NULL) {
37 self->per_cpu_values = alloc_percpu(int);
38 if (self->per_cpu_values != NULL) {
39 self->add = pcounter_dyn_add;
40 self->getval = pcounter_dyn_getval;
41 } else
42 rc = 1;
43 }
44 return rc;
45}
46EXPORT_SYMBOL_GPL(pcounter_alloc);
47
48void pcounter_free(struct pcounter *self)
49{
50 if (self->per_cpu_values != NULL) {
51 free_percpu(self->per_cpu_values);
52 self->per_cpu_values = NULL;
53 self->getval = NULL;
54 self->add = NULL;
55 }
56}
57EXPORT_SYMBOL_GPL(pcounter_free);
58
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