Cregit: Linux 6.11: smp_processor

Contributors: 15
Author	Tokens	Token Proportion	Commits	Commit Proportion
Ingo Molnar	83	42.35%	2	8.00%
Christoph Lameter	44	22.45%	1	4.00%
Linus Torvalds (pre-git)	14	7.14%	4	16.00%
Peter Zijlstra	13	6.63%	2	8.00%
Thomas Gleixner	13	6.63%	3	12.00%
Andrew Morton	11	5.61%	4	16.00%
Dmitry Torokhov	3	1.53%	1	4.00%
Masami Hiramatsu	3	1.53%	1	4.00%
Arnaldo Carvalho de Melo	2	1.02%	1	4.00%
Steven Rostedt	2	1.02%	1	4.00%
Sergey Senozhatsky	2	1.02%	1	4.00%
Yejune Deng	2	1.02%	1	4.00%
Tetsuo Handa	2	1.02%	1	4.00%
Greg Kroah-Hartman	1	0.51%	1	4.00%
Paul Gortmaker	1	0.51%	1	4.00%
Total	196		25

// 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 static
unsigned 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;

#ifdef CONFIG_SMP
	if (current->migration_disabled)
		goto out;
#endif

	/*
	 * 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);