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1 | #include <linux/module.h> |
2 | |
3 | /* validate @native and @pcp counter values match @expected */ |
4 | #define CHECK(native, pcp, expected) \ |
5 | do { \ |
6 | WARN((native) != (expected), \ |
7 | "raw %ld (0x%lx) != expected %lld (0x%llx)", \ |
8 | (native), (native), \ |
9 | (long long)(expected), (long long)(expected)); \ |
10 | WARN(__this_cpu_read(pcp) != (expected), \ |
11 | "pcp %ld (0x%lx) != expected %lld (0x%llx)", \ |
12 | __this_cpu_read(pcp), __this_cpu_read(pcp), \ |
13 | (long long)(expected), (long long)(expected)); \ |
14 | } while (0) |
15 | |
16 | static DEFINE_PER_CPU(long, long_counter); |
17 | static DEFINE_PER_CPU(unsigned long, ulong_counter); |
18 | |
19 | static int __init percpu_test_init(void) |
20 | { |
21 | /* |
22 | * volatile prevents compiler from optimizing it uses, otherwise the |
23 | * +ul_one/-ul_one below would replace with inc/dec instructions. |
24 | */ |
25 | volatile unsigned int ui_one = 1; |
26 | long l = 0; |
27 | unsigned long ul = 0; |
28 | |
29 | pr_info("percpu test start\n"); |
30 | |
31 | preempt_disable(); |
32 | |
33 | l += -1; |
34 | __this_cpu_add(long_counter, -1); |
35 | CHECK(l, long_counter, -1); |
36 | |
37 | l += 1; |
38 | __this_cpu_add(long_counter, 1); |
39 | CHECK(l, long_counter, 0); |
40 | |
41 | ul = 0; |
42 | __this_cpu_write(ulong_counter, 0); |
43 | |
44 | ul += 1UL; |
45 | __this_cpu_add(ulong_counter, 1UL); |
46 | CHECK(ul, ulong_counter, 1); |
47 | |
48 | ul += -1UL; |
49 | __this_cpu_add(ulong_counter, -1UL); |
50 | CHECK(ul, ulong_counter, 0); |
51 | |
52 | ul += -(unsigned long)1; |
53 | __this_cpu_add(ulong_counter, -(unsigned long)1); |
54 | CHECK(ul, ulong_counter, -1); |
55 | |
56 | ul = 0; |
57 | __this_cpu_write(ulong_counter, 0); |
58 | |
59 | ul -= 1; |
60 | __this_cpu_dec(ulong_counter); |
61 | CHECK(ul, ulong_counter, -1); |
62 | CHECK(ul, ulong_counter, ULONG_MAX); |
63 | |
64 | l += -ui_one; |
65 | __this_cpu_add(long_counter, -ui_one); |
66 | CHECK(l, long_counter, 0xffffffff); |
67 | |
68 | l += ui_one; |
69 | __this_cpu_add(long_counter, ui_one); |
70 | CHECK(l, long_counter, (long)0x100000000LL); |
71 | |
72 | |
73 | l = 0; |
74 | __this_cpu_write(long_counter, 0); |
75 | |
76 | l -= ui_one; |
77 | __this_cpu_sub(long_counter, ui_one); |
78 | CHECK(l, long_counter, -1); |
79 | |
80 | l = 0; |
81 | __this_cpu_write(long_counter, 0); |
82 | |
83 | l += ui_one; |
84 | __this_cpu_add(long_counter, ui_one); |
85 | CHECK(l, long_counter, 1); |
86 | |
87 | l += -ui_one; |
88 | __this_cpu_add(long_counter, -ui_one); |
89 | CHECK(l, long_counter, (long)0x100000000LL); |
90 | |
91 | l = 0; |
92 | __this_cpu_write(long_counter, 0); |
93 | |
94 | l -= ui_one; |
95 | this_cpu_sub(long_counter, ui_one); |
96 | CHECK(l, long_counter, -1); |
97 | CHECK(l, long_counter, ULONG_MAX); |
98 | |
99 | ul = 0; |
100 | __this_cpu_write(ulong_counter, 0); |
101 | |
102 | ul += ui_one; |
103 | __this_cpu_add(ulong_counter, ui_one); |
104 | CHECK(ul, ulong_counter, 1); |
105 | |
106 | ul = 0; |
107 | __this_cpu_write(ulong_counter, 0); |
108 | |
109 | ul -= ui_one; |
110 | __this_cpu_sub(ulong_counter, ui_one); |
111 | CHECK(ul, ulong_counter, -1); |
112 | CHECK(ul, ulong_counter, ULONG_MAX); |
113 | |
114 | ul = 3; |
115 | __this_cpu_write(ulong_counter, 3); |
116 | |
117 | ul = this_cpu_sub_return(ulong_counter, ui_one); |
118 | CHECK(ul, ulong_counter, 2); |
119 | |
120 | ul = __this_cpu_sub_return(ulong_counter, ui_one); |
121 | CHECK(ul, ulong_counter, 1); |
122 | |
123 | preempt_enable(); |
124 | |
125 | pr_info("percpu test done\n"); |
126 | return -EAGAIN; /* Fail will directly unload the module */ |
127 | } |
128 | |
129 | static void __exit percpu_test_exit(void) |
130 | { |
131 | } |
132 | |
133 | module_init(percpu_test_init) |
134 | module_exit(percpu_test_exit) |
135 | |
136 | MODULE_LICENSE("GPL"); |
137 | MODULE_AUTHOR("Greg Thelen"); |
138 | MODULE_DESCRIPTION("percpu operations test"); |
139 |
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