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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667// SPDX-License-Identifier: GPL-2.0/* * lib/smp_processor_id.c * * DEBUG_PREEMPT variant of smp_processor_id(). */#include <linux/export.h>#include <linux/kprobes.h>#include <linux/sched.h>
noinstr staticunsigned int check_preemption_disabled(const char *what1, const char *what2){ int this_cpu = raw_smp_processor_id();
if (likely(preempt_count())) goto out;
if (irqs_disabled()) goto out;
if (is_percpu_thread()) goto out;
if (current->migration_disabled) goto out;
/* * It is valid to assume CPU-locality during early bootup: */ if (system_state < SYSTEM_SCHEDULING) goto out;
/* * Avoid recursion: */ preempt_disable_notrace();
instrumentation_begin(); if (!printk_ratelimit()) goto out_enable;
printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n", what1, what2, preempt_count() - 1, current->comm, current->pid);
printk("caller is %pS\n", __builtin_return_address(0)); dump_stack();
out_enable: instrumentation_end(); preempt_enable_no_resched_notrace();out: return this_cpu;}
noinstr unsigned int debug_smp_processor_id(void){ return check_preemption_disabled("smp_processor_id", "");}EXPORT_SYMBOL(debug_smp_processor_id);
noinstr void __this_cpu_preempt_check(const char *op){ check_preemption_disabled("__this_cpu_", op);}EXPORT_SYMBOL(__this_cpu_preempt_check);