Re: [PATCH v5 1/2] x86/mm: add a function to check if a pfn is UC/UC-

[Paolo Bonzini]

On 08/11/2017 08:56, Haozhong Zhang wrote:
> +bool pat_pfn_is_uc_or_uc_minus(unsigned long pfn)
> +{
> +     enum page_cache_mode cm = lookup_memtype(PFN_PHYS(pfn));
> +
> +     return cm == _PAGE_CACHE_MODE_UC || cm == _PAGE_CACHE_MODE_UC_MINUS;
> +}
> +EXPORT_SYMBOL_GPL(pat_pfn_is_uc_or_uc_minus);
> +

As discussed in the reply to v2, this should include WC too.  The
function name could become something like pat_pfn_downgraded_by_uc_mtrr.

Thanks,

Paolo