* Borislav Petkov <[email protected]> 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 <[email protected]>
> > ---
> > 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
x86
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)
aspect:
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
all
around and works on hardware that gets tested on bleeding edge kernels, then
push
it upstream sooner rather than later and also have Cc:stable tags on the
obvious
fixes, and handle any eventual fallout as it happens.
That's the best we can do I think.
Thanks,
Ingo
