linux-kernel - Re: [PATCH] printk/nmi: Prevent deadlock when serializing NMI backtraces

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Message-ID: <20180619223222.6cf05e0b@vmware.local.home>
Date:   Tue, 19 Jun 2018 22:32:22 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        linux-kernel@...r.kernel.org, "4 . 13+" <stable@...r.kernel.org>
Subject: Re: [PATCH] printk/nmi: Prevent deadlock when serializing NMI
 backtraces

On Wed, 20 Jun 2018 10:58:34 +0900
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> wrote:

> Which one of these you'd prefer to see in ftrace_dump():
> 
> - printk_nmi_direct_enter() / printk_nmi_direct_exit()

The above appears to be the most sane.

-- Steve

> - printk_chatty_nmi_enter() / printk_chatty_nmi_exit()
> - printk_large_nmi_enter() / printk_large_nmi_exit()
> - printk_dump_nmi_enter() / printk_dump_nmi_exit()