Re: [PATCH] tracing: Partial revert of "tracing: Centralize preemptirq tracepoints and unify their usage"

[Steven Rostedt]

On Mon, 6 Aug 2018 21:54:32 -0400
Steven Rostedt <rost...@goodmis.org> wrote:

> --- a/kernel/trace/trace_preemptirq.c
> +++ b/kernel/trace/trace_preemptirq.c
> @@ -20,40 +20,52 @@ static DEFINE_PER_CPU(int, tracing_irq_cpu);
>  void trace_hardirqs_on(void)
>  {
>       if (!this_cpu_read(tracing_irq_cpu))
> -             return;
> +             goto out;
>  
>       trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
>       this_cpu_write(tracing_irq_cpu, 0);
> +
> + out:
> +     lockdep_hardirqs_on(CALLER_ADDR0);
>  }
>  EXPORT_SYMBOL(trace_hardirqs_on);
>  
>  void trace_hardirqs_off(void)
>  {
>       if (this_cpu_read(tracing_irq_cpu))
> -             return;
> +             goto out;
>  
>       this_cpu_write(tracing_irq_cpu, 1);
>       trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
> +
> + out:
> +     lockdep_hardirqs_off(CALLER_ADDR0);
>  }
>  EXPORT_SYMBOL(trace_hardirqs_off);
>  
>  __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
>  {
>       if (!this_cpu_read(tracing_irq_cpu))
> -             return;
> +             goto out;
>  
>       trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
>       this_cpu_write(tracing_irq_cpu, 0);
> +
> + out:
> +     lockdep_hardirqs_on(CALLER_ADDR0);
>  }
>  EXPORT_SYMBOL(trace_hardirqs_on_caller);
>  
>  __visible void trace_hardirqs_off_caller(unsigned long caller_addr)
>  {
>       if (this_cpu_read(tracing_irq_cpu))
> -             return;
> +             goto out;
>  
>       this_cpu_write(tracing_irq_cpu, 1);
>       trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
> +
> + out:
> +     lockdep_hardirqs_off(CALLER_ADDR0);
>  }
>  EXPORT_SYMBOL(trace_hardirqs_off_caller);
>  #endif /* CONFIG_TRACE_IRQFLAGS */

Hmm, the gotos above are rather ugly. This look better?

-- Steve


diff --git a/kernel/trace/trace_preemptirq.c b/kernel/trace/trace_preemptirq.c
index e76b78bf258e..fa656b25f427 100644
--- a/kernel/trace/trace_preemptirq.c
+++ b/kernel/trace/trace_preemptirq.c
@@ -19,41 +19,45 @@ static DEFINE_PER_CPU(int, tracing_irq_cpu);
 
 void trace_hardirqs_on(void)
 {
-       if (!this_cpu_read(tracing_irq_cpu))
-               return;
+       if (this_cpu_read(tracing_irq_cpu)) {
+               trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
+               this_cpu_write(tracing_irq_cpu, 0);
+       }
 
-       trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
-       this_cpu_write(tracing_irq_cpu, 0);
+       lockdep_hardirqs_on(CALLER_ADDR0);
 }
 EXPORT_SYMBOL(trace_hardirqs_on);
 
 void trace_hardirqs_off(void)
 {
-       if (this_cpu_read(tracing_irq_cpu))
-               return;
+       if (!this_cpu_read(tracing_irq_cpu)) {
+               this_cpu_write(tracing_irq_cpu, 1);
+               trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
+       }
 
-       this_cpu_write(tracing_irq_cpu, 1);
-       trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
+       lockdep_hardirqs_off(CALLER_ADDR0);
 }
 EXPORT_SYMBOL(trace_hardirqs_off);
 
 __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
 {
-       if (!this_cpu_read(tracing_irq_cpu))
-               return;
+       if (this_cpu_read(tracing_irq_cpu)) {
+               trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
+               this_cpu_write(tracing_irq_cpu, 0);
+       }
 
-       trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
-       this_cpu_write(tracing_irq_cpu, 0);
+       lockdep_hardirqs_on(CALLER_ADDR0);
 }
 EXPORT_SYMBOL(trace_hardirqs_on_caller);
 
 __visible void trace_hardirqs_off_caller(unsigned long caller_addr)
 {
-       if (this_cpu_read(tracing_irq_cpu))
-               return;
+       if (!this_cpu_read(tracing_irq_cpu)) {
+               this_cpu_write(tracing_irq_cpu, 1);
+               trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
+       }
 
-       this_cpu_write(tracing_irq_cpu, 1);
-       trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
+       lockdep_hardirqs_off(CALLER_ADDR0);
 }
 EXPORT_SYMBOL(trace_hardirqs_off_caller);
 #endif /* CONFIG_TRACE_IRQFLAGS */