/* * Provide a default dump_stack() function for architectures * which don't implement their own. */ #include #include #include #include #include static void __dump_stack(void) { dump_stack_print_info(KERN_DEFAULT); show_stack(NULL, NULL); } /** * dump_stack - dump the current task information and its stack trace * * Architectures can override this implementation by implementing its own. */ #ifdef CONFIG_SMP static atomic_t dump_lock = ATOMIC_INIT(-1); asmlinkage __visible void dump_stack(void) { unsigned long flags; int was_locked; int old; int cpu; /* * Permit this cpu to perform nested stack dumps while serialising * against other CPUs */ retry: local_irq_save(flags); cpu = smp_processor_id(); old = atomic_cmpxchg(&dump_lock, -1, cpu); if (old == -1) { was_locked = 0; } else if (old == cpu) { was_locked = 1; } else { local_irq_restore(flags); cpu_relax(); goto retry; } __dump_stack(); if (!was_locked) atomic_set(&dump_lock, -1); local_irq_restore(flags); } #else asmlinkage __visible void dump_stack(void) { __dump_stack(); } #endif EXPORT_SYMBOL(dump_stack); k net-next plumbingsTobias Klauser

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