Re: [RFC PATCH v2 1/3] mm: Don't pin ZERO_PAGE in pin_user_pages()

[David Howells]

Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:

> Shouldn't unpin_user_pages

It calls gup_put_folio() which is where the skip is.

> and bio_release_page also be updated to skip a zero page here?

Porbably best to leave it to unpin_user_page() there.  I've tried to hide the
behaviour entirely within gup.c.

David