/* * Define default pcounter functions * Note that often used pcounters use dedicated functions to get a speed increase. * (see DEFINE_PCOUNTER/REF_PCOUNTER_MEMBER) */ #include <linux/module.h> #include <linux/pcounter.h> #include <linux/smp.h> #include <linux/cpumask.h> static void pcounter_dyn_add(struct pcounter *self, int inc) { per_cpu_ptr(self->per_cpu_values, smp_processor_id())[0] += inc; } static int pcounter_dyn_getval(const struct pcounter *self, int cpu) { return per_cpu_ptr(self->per_cpu_values, cpu)[0]; } int pcounter_getval(const struct pcounter *self) { int res = 0, cpu; for_each_possible_cpu(cpu) res += self->getval(self, cpu); return res; } EXPORT_SYMBOL_GPL(pcounter_getval); int pcounter_alloc(struct pcounter *self) { int rc = 0; if (self->add == NULL) { self->per_cpu_values = alloc_percpu(int); if (self->per_cpu_values != NULL) { self->add = pcounter_dyn_add; self->getval = pcounter_dyn_getval; } else rc = 1; } return rc; } EXPORT_SYMBOL_GPL(pcounter_alloc); void pcounter_free(struct pcounter *self) { if (self->per_cpu_values != NULL) { free_percpu(self->per_cpu_values); self->per_cpu_values = NULL; self->getval = NULL; self->add = NULL; } } EXPORT_SYMBOL_GPL(pcounter_free);