Re: [PATCH v3 1/6] mm/thp: add prep_transhuge_device_private_page()

[Christoph Hellwig]

On Thu, Nov 05, 2020 at 04:51:42PM -0800, Ralph Campbell wrote:
> +extern void prep_transhuge_device_private_page(struct page *page);

No need for the extern.

> +static inline void prep_transhuge_device_private_page(struct page *page)
> +{
> +}

Is the code to call this even reachable if THP support is configured
out?  If not just declaring it unconditionally and letting dead code
elimination do its job might be a tad cleaner.

> +void prep_transhuge_device_private_page(struct page *page)

I think a kerneldoc comment explaining what this function is useful for
would be helpful.