2 * lib/smp_processor_id.c
4 * DEBUG_PREEMPT variant of smp_processor_id().
6 #include <linux/export.h>
7 #include <linux/kallsyms.h>
8 #include <linux/sched.h>
10 notrace
unsigned int debug_smp_processor_id(void)
12 unsigned long preempt_count
= preempt_count();
13 int this_cpu
= raw_smp_processor_id();
15 if (likely(preempt_count
))
22 * Kernel threads bound to a single CPU can safely use
25 if (cpumask_equal(tsk_cpus_allowed(current
), cpumask_of(this_cpu
)))
29 * It is valid to assume CPU-locality during early bootup:
31 if (system_state
!= SYSTEM_RUNNING
)
37 preempt_disable_notrace();
39 if (!printk_ratelimit())
42 printk(KERN_ERR
"BUG: using smp_processor_id() in preemptible [%08x] "
44 preempt_count() - 1, current
->comm
, current
->pid
);
45 print_symbol("caller is %s\n", (long)__builtin_return_address(0));
49 preempt_enable_no_resched_notrace();
54 EXPORT_SYMBOL(debug_smp_processor_id
);
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