From: Ingo Molnar Date: Sun, 14 Dec 2008 22:20:36 +0000 (+0100) Subject: perfcounters: release CPU context when exiting task counters X-Git-Tag: firefly_0821_release~13973^2~557 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0cc0c027d4e028632933f1be2dc4cd730358183b;p=firefly-linux-kernel-4.4.55.git perfcounters: release CPU context when exiting task counters If counters are exiting via do_exit() not via filp close, then the CPU context needs to be released - otherwise future percpu counter creations might fail. Signed-off-by: Ingo Molnar --- diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 539fa8283a06..16396e9406fa 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1273,8 +1273,19 @@ __perf_counter_exit_task(struct task_struct *child, local_irq_disable(); perf_flags = hw_perf_save_disable(); - if (child_counter->state == PERF_COUNTER_STATE_ACTIVE) + if (child_counter->state == PERF_COUNTER_STATE_ACTIVE) { + struct perf_cpu_context *cpuctx; + + cpuctx = &__get_cpu_var(perf_cpu_context); + child_counter->hw_ops->hw_perf_counter_disable(child_counter); + child_counter->state = PERF_COUNTER_STATE_INACTIVE; + child_counter->oncpu = -1; + + cpuctx->active_oncpu--; + child_ctx->nr_active--; + } + list_del_init(&child_counter->list_entry); hw_perf_restore(perf_flags); @@ -1539,4 +1550,3 @@ static int __init perf_counter_sysfs_init(void) &perfclass_attr_group); } device_initcall(perf_counter_sysfs_init); -