linux-kernel - Re: [PATCH v11 1/8] iov_iter: Define flags to qualify page extraction.

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Date:   Thu, 26 Jan 2023 21:54:16 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     David Howells <dhowells@...hat.com>
Cc:     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>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v11 1/8] iov_iter: Define flags to qualify page
 extraction.

On Thu, Jan 26, 2023 at 02:16:19PM +0000, David Howells wrote:

> +typedef unsigned int iov_iter_extraction_t;

> +/* Flags for iov_iter_get/extract_pages*() */
> +/* Allow P2PDMA on the extracted pages */
> +#define ITER_ALLOW_P2PDMA	((__force iov_iter_extraction_t)0x01)

That __force makes sense only if you make it a bitwise type -
otherwise it's meaningless.  IOW, either turn the typedef into

typedef unsigned int __bitwise iov_iter_extraction_t;

or lose __force in the cast...