linux-kernel - Re: [RFC PATCH 0/2] iov_iter: Provide a function to extract/pin/get pages from an iteraor

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Message-ID: <Y1/hSO+7kAJhGShG@casper.infradead.org>
Date:   Mon, 31 Oct 2022 14:52:56 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     viro@...iv.linux.org.uk, linux-mm@...r.kernel.org,
        John Hubbard <jhubbard@...dia.com>,
        linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        smfrench@...il.com, torvalds@...ux-foundation.org,
        linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] iov_iter: Provide a function to extract/pin/get
 pages from an iteraor

On Mon, Oct 31, 2022 at 02:49:32PM +0000, David Howells wrote:
> I added a macro by which you can query an iterator to find out how the
> extraction function will treat the pages (it returns 0, FOLL_GET or FOLL_PIN
> as appropriate).  Note that it's a macro to avoid #inclusion of linux/mm.h in
> linux/uio.h.

I'd support moving FOLL_* definitions to mm_types.h along with
FAULT_FLAG_* and VM_FAULT_*.