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1 | /* |
2 | * lib/smp_processor_id.c |
3 | * |
4 | * DEBUG_PREEMPT variant of smp_processor_id(). |
5 | */ |
6 | #include <linux/export.h> |
7 | #include <linux/kallsyms.h> |
8 | #include <linux/sched.h> |
9 | |
10 | notrace unsigned int debug_smp_processor_id(void) |
11 | { |
12 | int this_cpu = raw_smp_processor_id(); |
13 | |
14 | if (likely(preempt_count())) |
15 | goto out; |
16 | |
17 | if (irqs_disabled()) |
18 | goto out; |
19 | |
20 | /* |
21 | * Kernel threads bound to a single CPU can safely use |
22 | * smp_processor_id(): |
23 | */ |
24 | if (cpumask_equal(tsk_cpus_allowed(current), cpumask_of(this_cpu))) |
25 | goto out; |
26 | |
27 | /* |
28 | * It is valid to assume CPU-locality during early bootup: |
29 | */ |
30 | if (system_state != SYSTEM_RUNNING) |
31 | goto out; |
32 | |
33 | /* |
34 | * Avoid recursion: |
35 | */ |
36 | preempt_disable_notrace(); |
37 | |
38 | if (!printk_ratelimit()) |
39 | goto out_enable; |
40 | |
41 | printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] " |
42 | "code: %s/%d\n", |
43 | preempt_count() - 1, current->comm, current->pid); |
44 | print_symbol("caller is %s\n", (long)__builtin_return_address(0)); |
45 | dump_stack(); |
46 | |
47 | out_enable: |
48 | preempt_enable_no_resched_notrace(); |
49 | out: |
50 | return this_cpu; |
51 | } |
52 | |
53 | EXPORT_SYMBOL(debug_smp_processor_id); |
54 | |
55 |
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od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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