From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- lib/smp_processor_id.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 lib/smp_processor_id.c (limited to 'lib/smp_processor_id.c') diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c new file mode 100644 index 0000000000..a2bb7738c3 --- /dev/null +++ b/lib/smp_processor_id.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * lib/smp_processor_id.c + * + * DEBUG_PREEMPT variant of smp_processor_id(). + */ +#include +#include +#include + +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); -- cgit v1.2.3