Re: printk() with a spin-lock held.

[Andrew Morton]

Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
>
> On Fri, 2004-10-22 at 15:07 -0400, Richard B. Johnson wrote:
> > Linux-2.6.9 will bug-check and halt if my code executes
> > a printk() with a spin-lock held.
> > 
> > Is this the intended behavior?
> 
> Yes.  printk() can sleep.  No sleeping with a spinlock held.
> 

printk() does not sleep and may be called from any context except

a) NMI handlers and

b) when holding a scheduler runqueue->lock while klogd is running.
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