Re: [PATCH v3 5/6] x86/pti: Do not enable PTI on processors which are not vulnerable to Meltdown

[Greg KH]

On Wed, Jan 24, 2018 at 04:57:04PM +0000, David Woodhouse wrote:
> Some old Atoms, anything in family 5 or 4, and newer CPUs when they advertise
> the IA32_ARCH_CAPABILITIES MSR and it has the RDCL_NO bit set, are not vulnerable.
> 
> Roll the AMD exemption into the x86_match_cpu() table too.
> 
> Based on suggestions from Dave Hansen and Alan Cox.
> 
> Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>