linux-kernel - Re: [GIT PULL] tracing/NMI/printk: Use seq_buf for safe printing from NMI context

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Message-ID: <CA+55aFxKSzUU7EMDyV9voi0MjzE+2AFeT8t_Fs=dUV2f5rndvw@mail.gmail.com>
Date:	Thu, 11 Dec 2014 11:41:21 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Kosina <jkosina@...e.cz>, Petr Mladek <pmladek@...e.cz>
Subject: Re: [GIT PULL] tracing/NMI/printk: Use seq_buf for safe printing from
 NMI context

On Thu, Dec 11, 2014 at 3:33 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> So you are saying that anytime the printk_func is not the default, the
> caller had to have disable preemption?

Yes. That, or change all of the vprintk_func entries. Otherwise, the
caller itself obviously doesn't know which cpu version it would get,
so disabling preemption inside printk is simply much too late.

                     Linus
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