linux-kernel - Re: [PATCH v6 2/2] tracing: Add support for preempt and irq enable/disable events

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Date:   Mon, 2 Oct 2017 15:37:56 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@...roid.com
Subject: Re: [PATCH v6 2/2] tracing: Add support for preempt and irq
 enable/disable events

On Mon, 2 Oct 2017 12:33:30 -0700
Joel Fernandes <joelaf@...gle.com> wrote:


> diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
> index 5dd1272d1ab2..2a1af0dd9cc4 100644
> --- a/include/linux/irqflags.h
> +++ b/include/linux/irqflags.h
> @@ -93,7 +93,9 @@
>  #define local_irq_save(flags)                          \
>         do {                                            \
>                 raw_local_irq_save(flags);              \
> -               trace_hardirqs_off();                   \
> +               if (!raw_irqs_disabled_flags(flags)) {  \
> +                       trace_hardirqs_off();           \
> +               }                                       \
>         } while (0)
> 
> 
> @@ -101,7 +103,6 @@
>         do {                                            \
>                 if (raw_irqs_disabled_flags(flags)) {   \
>                         raw_local_irq_restore(flags);   \
> -                       trace_hardirqs_off();           \
>                 } else {                                \
>                         trace_hardirqs_on();            \
>                         raw_local_irq_restore(flags);   \

I rather have the protection in trace_hardirqs_on/off(). Let's keep the
ugliness from spreading.

-- Steve