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

From: Linus Torvalds
Date: Thu Dec 11 2014 - 14:41:27 EST

On Thu, Dec 11, 2014 at 3:33 AM, Steven Rostedt <rostedt@xxxxxxxxxxx> 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.

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