linux-kernel - Re: [PATCH v8 10/10] mm: Renumber FOLL_PIN and FOLL

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Message-ID: <Y8/n1AdBwbYqp8lX@nvidia.com>
Date:   Tue, 24 Jan 2023 10:14:44 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     David Howells <dhowells@...hat.com>
Cc:     John Hubbard <jhubbard@...dia.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        linux-mm@...ck.org
Subject: Re: [PATCH v8 10/10] mm: Renumber FOLL_PIN and FOLL_GET down

On Tue, Jan 24, 2023 at 02:11:50PM +0000, David Howells wrote:
> Jason Gunthorpe <jgg@...dia.com> wrote:
> 
> > if (cleanup_flags & PAGE_CLEANUP_UNPIN)
> >    gup_put_folio(folio, 1, true);
> > else if (cleanup_flags & PAGE_CLEANUP_PUT)
> >    gup_put_folio(folio, 1, false);
> 
> gup_put_folio() doesn't take a bool - it takes FOLL_PIN and FOLL_GET:

My point was to change that to take a 'bool unpin' because FOLL_PIN is
not to be used outside gup.c

Jason