Re: [PATCH v2 01/46] mm: Add folio_to_pfn()

[Matthew Wilcox]

On Wed, Jun 23, 2021 at 08:49:55AM +0100, Christoph Hellwig wrote:
> On Tue, Jun 22, 2021 at 01:15:06PM +0100, Matthew Wilcox (Oracle) wrote:
> > The pfn of a folio is the pfn of its head page.
> > 
> > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> 
> Maybe add a kerneldoc comment stating that?

/**
 * folio_to_pfn - Return the Page Frame Number of a folio.
 * @folio: The folio.
 *
 * A folio may contain multiple pages.  The pages have consecutive
 * Page Frame Numbers.
 *
 * Return: The Page Frame Number of the first page in the folio.
 */