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

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To: David Howells <dhowells@xxxxxxxxxx>
Subject: Re: [PATCH v6 08/34] mm: Provide a helper to drop a pin/ref on a page
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 17 Jan 2023 00:02:23 -0800
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, Logan Gunthorpe <logang@xxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <167391053934.2311931.17229969100836070492.stgit@warthog.procyon.org.uk>

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.

References:
- [PATCH v6 00/34] iov_iter: Improve page extraction (ref, pin or just list)
  - From: David Howells
- [PATCH v6 08/34] mm: Provide a helper to drop a pin/ref on a page
  - From: David Howells

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