int prof_on __read_mostly;
EXPORT_SYMBOL_GPL(prof_on);
-static cpumask_var_t prof_cpu_mask;
#if defined(CONFIG_SMP) && defined(CONFIG_PROC_FS)
static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits);
static DEFINE_PER_CPU(int, cpu_profile_flip);
buffer_bytes = prof_len*sizeof(atomic_t);
- if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
- return -ENOMEM;
-
- cpumask_copy(prof_cpu_mask, cpu_possible_mask);
-
prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL|__GFP_NOWARN);
if (prof_buffer)
return 0;
if (prof_buffer)
return 0;
- free_cpumask_var(prof_cpu_mask);
return -ENOMEM;
}
struct page *page;
int i;
- if (cpumask_available(prof_cpu_mask))
- cpumask_clear_cpu(cpu, prof_cpu_mask);
-
for (i = 0; i < 2; i++) {
if (per_cpu(cpu_profile_hits, cpu)[i]) {
page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[i]);
return 0;
}
-static int profile_online_cpu(unsigned int cpu)
-{
- if (cpumask_available(prof_cpu_mask))
- cpumask_set_cpu(cpu, prof_cpu_mask);
-
- return 0;
-}
-
#else /* !CONFIG_SMP */
#define profile_flip_buffers() do { } while (0)
#define profile_discard_flip_buffers() do { } while (0)
{
struct pt_regs *regs = get_irq_regs();
- if (!user_mode(regs) && cpumask_available(prof_cpu_mask) &&
- cpumask_test_cpu(smp_processor_id(), prof_cpu_mask))
+ /* This is the old kernel-only legacy profiling */
+ if (!user_mode(regs))
profile_hit(type, (void *)profile_pc(regs));
}
int __ref create_proc_profile(void)
{
struct proc_dir_entry *entry;
-#ifdef CONFIG_SMP
- enum cpuhp_state online_state;
-#endif
-
int err = 0;
if (!prof_on)
profile_prepare_cpu, profile_dead_cpu);
if (err)
return err;
-
- err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "AP_PROFILE_ONLINE",
- profile_online_cpu, NULL);
- if (err < 0)
- goto err_state_prep;
- online_state = err;
- err = 0;
#endif
entry = proc_create("profile", S_IWUSR | S_IRUGO,
NULL, &profile_proc_ops);
- if (!entry)
- goto err_state_onl;
- proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t));
-
- return err;
-err_state_onl:
+ if (entry)
+ proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t));
#ifdef CONFIG_SMP
- cpuhp_remove_state(online_state);
-err_state_prep:
- cpuhp_remove_state(CPUHP_PROFILE_PREPARE);
+ else
+ cpuhp_remove_state(CPUHP_PROFILE_PREPARE);
#endif
return err;
}