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6
7#include <linux/export.h>
8#include <linux/sched.h>
9
10notrace static unsigned int check_preemption_disabled(const char *what1,
11 const char *what2)
12{
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
23
24
25 if (cpumask_equal(¤t->cpus_allowed, cpumask_of(this_cpu)))
26 goto out;
27
28
29
30
31 if (system_state < SYSTEM_SCHEDULING)
32 goto out;
33
34
35
36
37 preempt_disable_notrace();
38
39 if (!printk_ratelimit())
40 goto out_enable;
41
42 printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n",
43 what1, what2, preempt_count() - 1, current->comm, current->pid);
44
45 printk("caller is %pS\n", __builtin_return_address(0));
46 dump_stack();
47
48out_enable:
49 preempt_enable_no_resched_notrace();
50out:
51 return this_cpu;
52}
53
54notrace unsigned int debug_smp_processor_id(void)
55{
56 return check_preemption_disabled("smp_processor_id", "");
57}
58EXPORT_SYMBOL(debug_smp_processor_id);
59
60notrace void __this_cpu_preempt_check(const char *op)
61{
62 check_preemption_disabled("__this_cpu_", op);
63}
64EXPORT_SYMBOL(__this_cpu_preempt_check);
65