linux-kernel - Re: [PATCH] printk/tracing: Do not trace printk_nmi

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Message-ID: <20180907095533.5b5febc2@gandalf.local.home>
Date:   Fri, 7 Sep 2018 09:55:33 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] printk/tracing: Do not trace printk_nmi_enter()

On Fri, 7 Sep 2018 15:45:32 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> Yes really, we should not muck with the IRQ state from NMI context.

Right, and we didn't. Your patch didn't change anything, but allow for
printk_nmi_enter/exit() to be traced by ftrace, but that's wrong to
begin with because it ftrace_nmi_enter() hasn't been called yet.

-- Steve