Re: [PATCH] mm, page_vma_mapped: Introduce pfn_in_hpage()

[Linus Torvalds]

On Mon, Jan 22, 2018 at 1:22 AM, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> The new helper would check if the pfn belongs to the page. For huge
> pages it checks if the PFN is within range covered by the huge page.
>
> The helper is used in check_pte(). The original code the helper replaces
> had two call to page_to_pfn(). page_to_pfn() is relatively costly.
>
> Although current GCC is able to optimize code to have one call, it's
> better to do this explicitly.

Thanks, I applied it directly, since your page_vma_mapped fix was
still my top commit, and I asked for this cleanup.

             Linus