linux-kernel - Re: [PATCH v6 08/34] mm: Provide a helper to drop a pin/ref on a page

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Message-ID: <2330571.1673943691@warthog.procyon.org.uk>
Date:   Tue, 17 Jan 2023 08:21:31 +0000
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        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
Subject: Re: [PATCH v6 08/34] mm: Provide a helper to drop a pin/ref on a page

Christoph Hellwig <hch@...radead.org> wrote:

> On Mon, Jan 16, 2023 at 11:08:59PM +0000, David Howells wrote:
> > Provide a helper in the get_user_pages code to drop a pin or a ref on a
> > page based on being given FOLL_GET or FOLL_PIN in its flags argument or do
> > nothing if neither is set.
> 
> Please don't add new page based helpers.

Yes, I know, but all of the callers still use pages, not folios.

David