2 * lib/smp_processor_id.c
4 * DEBUG_PREEMPT variant of smp_processor_id().
6 #include <linux/module.h>
7 #include <linux/kallsyms.h>
8 #include <linux/sched.h>
10 unsigned int debug_smp_processor_id(void)
12 unsigned long preempt_count
= preempt_count();
13 int this_cpu
= raw_smp_processor_id();
16 if (likely(preempt_count
))
23 * Kernel threads bound to a single CPU can safely use
26 this_mask
= cpumask_of_cpu(this_cpu
);
28 if (cpus_equal(current
->cpus_allowed
, this_mask
))
32 * It is valid to assume CPU-locality during early bootup:
34 if (system_state
!= SYSTEM_RUNNING
)
42 if (!printk_ratelimit())
45 printk(KERN_ERR
"BUG: using smp_processor_id() in preemptible [%08x] code: %s/%d\n", preempt_count(), current
->comm
, current
->pid
);
46 print_symbol("caller is %s\n", (long)__builtin_return_address(0));
50 preempt_enable_no_resched();
55 EXPORT_SYMBOL(debug_smp_processor_id
);
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