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65 lines
1.4 KiB
65 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0
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/*
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* lib/smp_processor_id.c
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*
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* DEBUG_PREEMPT variant of smp_processor_id().
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*/
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#include <linux/export.h>
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#include <linux/kallsyms.h>
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#include <linux/sched.h>
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notrace static unsigned int check_preemption_disabled(const char *what1,
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const char *what2)
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{
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int this_cpu = raw_smp_processor_id();
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if (likely(preempt_count()))
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goto out;
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if (irqs_disabled())
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goto out;
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/*
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* Kernel threads bound to a single CPU can safely use
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* smp_processor_id():
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*/
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if (cpumask_equal(¤t->cpus_allowed, cpumask_of(this_cpu)))
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goto out;
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/*
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* It is valid to assume CPU-locality during early bootup:
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*/
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if (system_state < SYSTEM_SCHEDULING)
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goto out;
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/*
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* Avoid recursion:
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*/
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preempt_disable_notrace();
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if (!printk_ratelimit())
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goto out_enable;
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printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n",
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what1, what2, preempt_count() - 1, current->comm, current->pid);
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print_symbol("caller is %s\n", (long)__builtin_return_address(0));
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dump_stack();
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out_enable:
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preempt_enable_no_resched_notrace();
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out:
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return this_cpu;
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}
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notrace unsigned int debug_smp_processor_id(void)
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{
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return check_preemption_disabled("smp_processor_id", "");
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}
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EXPORT_SYMBOL(debug_smp_processor_id);
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notrace void __this_cpu_preempt_check(const char *op)
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{
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check_preemption_disabled("__this_cpu_", op);
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}
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EXPORT_SYMBOL(__this_cpu_preempt_check);
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