linux-kernel - Re: [RFC PATCH 01/11] iov_iter: Fix comment refs to iov_iter_get_pages/pages

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Date:   Thu, 6 Jul 2023 08:21:08 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Christian Brauner <christian@...uner.io>
Subject: Re: [RFC PATCH 01/11] iov_iter: Fix comment refs to
 iov_iter_get_pages/pages_alloc()

On Fri, Jun 30, 2023 at 04:25:14PM +0100, David Howells wrote:
>  	/*
>  	 * FOLL_LONGTERM indicates that the page will be held for an indefinite
>  	 * time period _often_ under userspace control.  This is in contrast to
> -	 * iov_iter_get_pages(), whose usages are transient.
> +	 * iov_iter_get_pages2(), whose usages are transient.
>  	 */

I don't think this should refer to iov_iter_get_pages* at all.  The
flag should document that actual get/pin_user interfaces and not refer
to a (deprecated) interface built on top of it.