Re: [PATCH] x86, trace: Add __irq_entry annotation to x86's platform IRQ handlers

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> On Wed,  4 Jan 2017 12:20:33 +0100
> Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> wrote:
> 
> > This patch adds the __irq_entry annotation to the defaults x86's
> > platform IRQ handlers. ftrace's function_graph tracer uses the
> > __irq_entry annotation to notify the entry and return of IRQ
> > handlers.
> > 
> > For example, before the patch:
> >   354549.667252 |   3)  d..1              |  default_idle_call() {
> >   354549.667252 |   3)  d..1              |    arch_cpu_idle() {
> >   354549.667253 |   3)  d..1              |      default_idle() {
> >   354549.696886 |   3)  d..1              |        smp_trace_reschedule_interrupt() {
> >   354549.696886 |   3)  d..1              |          irq_enter() {
> >   354549.696886 |   3)  d..1              |            rcu_irq_enter() {
> > 
> > After the patch:
> >   366416.254476 |   3)  d..1              |    arch_cpu_idle() {
> >   366416.254476 |   3)  d..1              |      default_idle() {
> >   366416.261566 |   3)  d..1  ==========> |
> >   366416.261566 |   3)  d..1              |        smp_trace_reschedule_interrupt() {
> >   366416.261566 |   3)  d..1              |          irq_enter() {
> >   366416.261566 |   3)  d..1              |            rcu_irq_enter() {
> > 
> > KASAN also uses this annotation. The smp_apic_timer_interrupt
> > was already annotated.
> 
> Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
> 
> Thomas or Ingo, want to take this in tip?

Yeah, queued it up for v4.11.

Thanks,

	Ingo