[PATCH 1/4] hugetlbfs: add arch_hugetlb_valid_size

[Dave Hansen]

On 3/18/20 3:52 PM, Mike Kravetz wrote:
> Sounds good.  I'll incorporate those changes into a v2, unless someone
> else with has a different opinion.
> 
> BTW, this patch should not really change the way the code works today.
> It is mostly a movement of code.  Unless I am missing something, the
> existing code will always allow setup of PMD_SIZE hugetlb pages.

Hah, I totally skipped over the old code in the diff.

It looks like we'll disable hugetblfs *entirely* if PSE isn't supported.
 I think this is actually wrong, but nobody ever noticed.  I think you'd
have to be running as a guest under a hypervisor that's lying about PSE
not being supported *and* care about 1GB pages.  Nobody does that.