diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_uncore.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c index 75da9e1..50d4a1c 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c @@ -2622,6 +2622,21 @@ static void __init uncore_pci_exit(void) } } +/* CPU hot plug/unplug are serialized by cpu_add_remove_lock mutex */ +static LIST_HEAD(boxes_to_free); + +static void __cpuinit uncore_kfree_boxes(void) +{ + struct intel_uncore_box *box; + + while (!list_empty(&boxes_to_free)) { + box = list_entry(boxes_to_free.next, + struct intel_uncore_box, list); + list_del(&box->list); + kfree(box); + } +} + static void __cpuinit uncore_cpu_dying(int cpu) { struct intel_uncore_type *type; @@ -2636,7 +2651,7 @@ static void __cpuinit uncore_cpu_dying(int cpu) box = *per_cpu_ptr(pmu->box, cpu); *per_cpu_ptr(pmu->box, cpu) = NULL; if (box && atomic_dec_and_test(&box->refcnt)) - kfree(box); + list_add(&box->list, &boxes_to_free); } } } @@ -2666,8 +2681,11 @@ static int __cpuinit uncore_cpu_starting(int cpu) if (exist && exist->phys_id == phys_id) { atomic_inc(&exist->refcnt); *per_cpu_ptr(pmu->box, cpu) = exist; - kfree(box); - box = NULL; + if (box) { + list_add(&box->list, + &boxes_to_free); + box = NULL; + } break; } } @@ -2806,6 +2824,10 @@ static int case CPU_DYING: uncore_cpu_dying(cpu); break; + case CPU_ONLINE: + case CPU_DEAD: + uncore_kfree_boxes(); + break; default: break; } |
