Re: frequent lockups in 3.18rc4

[Steven Rostedt]

On Fri, Nov 21, 2014 at 08:48:58AM -0800, Linus Torvalds wrote:
> 
> (The 64-bit mode also has a "WARN_ON_ONCE(in_nmi())", which I guess is
> good - but it's good because the 64-bit version is written the way it
> is).

Actually, in_nmi() is now safe for vmalloc faults. In fact, it handles the
clobbering of the cr2 register just fine. I wrote tests to test this, and
submitted patches to get rid of that warn on. But that never went through.

https://lkml.org/lkml/2013/10/15/894

-- Steve

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