linux-kernel - Re: [PATCH V4 10/12] trace: Add osnoise tracer

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Date:   Fri, 18 Jun 2021 13:55:11 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     Phil Auld <pauld@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Kate Carcia <kcarcia@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Clark Willaims <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 10/12] trace: Add osnoise tracer

On Tue, 15 Jun 2021 11:28:49 +0200
Daniel Bristot de Oliveira <bristot@...hat.com> wrote:

> diff --git a/arch/x86/kernel/trace.c b/arch/x86/kernel/trace.c
> new file mode 100644
> index 000000000000..e67d63657628
> --- /dev/null
> +++ b/arch/x86/kernel/trace.c
> @@ -0,0 +1,238 @@
> +#include <asm/trace/irq_vectors.h>
> +
> +#ifdef CONFIG_OSNOISE_TRACER
> +extern void osnoise_trace_irq_entry(int id);
> +extern void osnoise_trace_irq_exit(int id, const char *desc);

Any reason to have the above outside the LOCAL_APIC def? It's not used.
In fact, this could just be turned into:

#if defined(CONFIG_OSNOISE_TRAECR) && defined(CONFIG_X86_LOCAL_APIC)

-- Steve


> +
> +#ifdef CONFIG_X86_LOCAL_APIC

[..]

> +#endif /* CONFIG_X86_LOCAL_APIC */
> +#endif /* CONFIG_OSNOISE_TRACER */