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

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:

quoted

The pfn of a folio is the pfn of its head page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

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.
 */