[PATCH 4.0-rc1 v17 4/6] printk: Simple implementation for NMI backtracing

[Joe Perches]

On Wed, 2015-03-04 at 10:12 +0000, Daniel Thompson wrote:
> Currently there is a quite a pile of code sitting in
> arch/x86/kernel/apic/hw_nmi.c to support safe all-cpu backtracing from NMI.
> The code is inaccessible to backtrace implementations for other
> architectures, which is a shame because they would probably like to be
> safe too.
> 
> Copy this code into printk. We'll port the x86 NMI backtrace to it in a
> later patch.

I think this would be better as a separate file
rather than increasing the bulk of printk.c