diff options
Diffstat (limited to 'kernel/trace/trace_irqsoff.c')
| -rw-r--r-- | kernel/trace/trace_irqsoff.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c index 770cd30cda40..ffbf1505d5bc 100644 --- a/kernel/trace/trace_irqsoff.c +++ b/kernel/trace/trace_irqsoff.c @@ -603,14 +603,40 @@ static void irqsoff_tracer_stop(struct trace_array *tr) */ static void tracer_hardirqs_on(void *none, unsigned long a0, unsigned long a1) { + /* + * Tracepoint probes are expected to be called with preempt disabled, + * We don't care about being called with preempt disabled but we need + * to know in the future if that changes so we can remove the next + * preempt_enable. + */ + WARN_ON_ONCE(!preempt_count()); + + /* Tracepoint probes disable preemption atleast once, account for that */ + preempt_enable_notrace(); + if (!preempt_trace() && irq_trace()) stop_critical_timing(a0, a1); + + preempt_disable_notrace(); } static void tracer_hardirqs_off(void *none, unsigned long a0, unsigned long a1) { + /* + * Tracepoint probes are expected to be called with preempt disabled, + * We don't care about being called with preempt disabled but we need + * to know in the future if that changes so we can remove the next + * preempt_enable. + */ + WARN_ON_ONCE(!preempt_count()); + + /* Tracepoint probes disable preemption atleast once, account for that */ + preempt_enable_notrace(); + if (!preempt_trace() && irq_trace()) start_critical_timing(a0, a1); + + preempt_disable_notrace(); } static int irqsoff_tracer_init(struct trace_array *tr) |