* Borislav Petkov <b...@alien8.de> wrote:

> On Wed, Nov 30, 2016 at 12:34:55PM -0800, Andy Lutomirski wrote:
> > Aside from being excessively slow, CPUID is problematic: Linux runs
> > on a handful of CPUs that don't have CPUID.  MOV to CR2 is always
> > available, so use it instead.
> > 
> > Signed-off-by: Andy Lutomirski <l...@kernel.org>
> > ---
> >  arch/x86/include/asm/processor.h | 31 ++++++++-----------------------
> >  1 file changed, 8 insertions(+), 23 deletions(-)
> Looks nice.
> I'm wondering if we should leave this one in tip for an additional cycle
> to have it tested on more hw. I know, it is architectural and so on but
> who knows what every implementation actually does...

I think -tip and "upstream of the day" mostly gets tested on relatively recent 
hardware - proven by the fact that these regressions are many months old.

The reason v4.9 got extra testing is the announced Long Term Support (LTS) 
more, older, weirder hardware is being tested because it's going to be a very 
popular base kernel.

So the best option would be to get these fixes into -tip, make sure it's sane 
around and works on hardware that gets tested on bleeding edge kernels, then 
it upstream sooner rather than later and also have Cc:stable tags on the 
fixes, and handle any eventual fallout as it happens.

That's the best we can do I think.



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