Re: [PATCH 2/3] x86/mm: introduce __PAGE_KERNEL_GLOBAL

[Dave Hansen]

On 02/16/2018 11:54 AM, Nadav Amit wrote:
>> But I don't really want to hide that gunk in a macro like that.  It
>> might make more sense as a static inline.  I'll give that a shot and resent.
> Since determining whether PTI is on is done in several places in the kernel,
> maybe there should a single function to determine whether PTI is on,
> something like:
> 
> static inline bool is_pti_on(void)
> {
> 	return IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION) && 
> 		static_cpu_has(X86_FEATURE_PTI);
> }

We should be able to do it with disabled-features.h and the X86_FEATURE
bit.  I'll look into it.