| * DEBUG_PREEMPT variant of smp_processor_id(). |
| #include <linux/module.h> |
| #include <linux/kallsyms.h> |
| notrace unsigned int debug_smp_processor_id(void) |
| unsigned long preempt_count = preempt_count(); |
| int this_cpu = raw_smp_processor_id(); |
| if (likely(preempt_count)) |
| * Kernel threads bound to a single CPU can safely use |
| if (cpumask_equal(¤t->cpus_allowed, cpumask_of(this_cpu))) |
| * It is valid to assume CPU-locality during early bootup: |
| if (system_state != SYSTEM_RUNNING) |
| preempt_disable_notrace(); |
| printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] " |
| preempt_count() - 1, current->comm, current->pid); |
| print_symbol("caller is %s\n", (long)__builtin_return_address(0)); |
| preempt_enable_no_resched_notrace(); |
| EXPORT_SYMBOL(debug_smp_processor_id); |