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Linux/lib/smp_processor_id.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * lib/smp_processor_id.c
  4  *
  5  * DEBUG_PREEMPT variant of smp_processor_id().
  6  */
  7 #include <linux/export.h>
  8 #include <linux/sched.h>
  9 
 10 notrace 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          * Kernel threads bound to a single CPU can safely use
 23          * smp_processor_id():
 24          */
 25         if (cpumask_equal(&current->cpus_allowed, 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_SCHEDULING)
 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 %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 
 48 out_enable:
 49         preempt_enable_no_resched_notrace();
 50 out:
 51         return this_cpu;
 52 }
 53 
 54 notrace unsigned int debug_smp_processor_id(void)
 55 {
 56         return check_preemption_disabled("smp_processor_id", "");
 57 }
 58 EXPORT_SYMBOL(debug_smp_processor_id);
 59 
 60 notrace void __this_cpu_preempt_check(const char *op)
 61 {
 62         check_preemption_disabled("__this_cpu_", op);
 63 }
 64 EXPORT_SYMBOL(__this_cpu_preempt_check);
 65 

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