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Source at commit b13e7eb172b6f08e5fc22da162bdde5fcde201b5 created 11 years 11 months ago. By Maarten ter Huurne, fbcon: Add 6x10 font | |
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1 | /* |
2 | * lib/smp_processor_id.c |
3 | * |
4 | * DEBUG_PREEMPT variant of smp_processor_id(). |
5 | */ |
6 | #include <linux/module.h> |
7 | #include <linux/kallsyms.h> |
8 | #include <linux/sched.h> |
9 | |
10 | notrace unsigned int debug_smp_processor_id(void) |
11 | { |
12 | unsigned long preempt_count = preempt_count(); |
13 | int this_cpu = raw_smp_processor_id(); |
14 | |
15 | if (likely(preempt_count)) |
16 | goto out; |
17 | |
18 | if (irqs_disabled()) |
19 | goto out; |
20 | |
21 | /* |
22 | * Kernel threads bound to a single CPU can safely use |
23 | * smp_processor_id(): |
24 | */ |
25 | if (cpumask_equal(tsk_cpus_allowed(current), cpumask_of(this_cpu))) |
26 | goto out; |
27 | |
28 | /* |
29 | * It is valid to assume CPU-locality during early bootup: |
30 | */ |
31 | if (system_state != SYSTEM_RUNNING) |
32 | goto out; |
33 | |
34 | /* |
35 | * Avoid recursion: |
36 | */ |
37 | preempt_disable_notrace(); |
38 | |
39 | if (!printk_ratelimit()) |
40 | goto out_enable; |
41 | |
42 | printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] " |
43 | "code: %s/%d\n", |
44 | preempt_count() - 1, current->comm, current->pid); |
45 | print_symbol("caller is %s\n", (long)__builtin_return_address(0)); |
46 | dump_stack(); |
47 | |
48 | out_enable: |
49 | preempt_enable_no_resched_notrace(); |
50 | out: |
51 | return this_cpu; |
52 | } |
53 | |
54 | EXPORT_SYMBOL(debug_smp_processor_id); |
55 | |
56 |
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od-2011-09-04
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v2.6.34-rc5
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v3.9