On Mon, Aug 20, 2018 at 1:37 PM Andi Kleen [off-list ref] wrote:

From: Andi Kleen <redacted>

Create a pgd_pfn() macro similar to the p[4um]d_pfn() macros and then
use the p[g4um]d_pfn() macros in the p[g4um]d_page() macros instead of
duplicating the code.

When doing backports, _please_ explicitly specify which commit this is
upstream too.

Also, the original upstream patch is credited to Tom Lendacky.

Or is there something I'm not seeing, and this is different from
commit fd7e315988b7 ("x86/mm: Simplify p[g4um]d_page() macros")?

               Linus