linux-kernel - Re: [PATCH man-pages 3/5] ioctl_userfaultfd.2: add BUGS section

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Date:   Mon, 1 May 2017 20:33:50 +0200
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc:     mtk.manpages@...il.com, Andrea Arcangeli <aarcange@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-man@...r.kernel.org
Subject: Re: [PATCH man-pages 3/5] ioctl_userfaultfd.2: add BUGS section

Hi Mike,

I've applied this, but have a question.

On 05/01/2017 07:43 AM, Mike Rapoport wrote:
> The features handshake is not quite convenient.
> Elaborate about it in the BUGS section.
> 
> Signed-off-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
> ---
>  man2/ioctl_userfaultfd.2 | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2
> index e12b9de..50316de 100644
> --- a/man2/ioctl_userfaultfd.2
> +++ b/man2/ioctl_userfaultfd.2
> @@ -650,6 +650,15 @@ operations are Linux-specific.
>  .SH EXAMPLE
>  See
>  .BR userfaultfd (2).
> +.SH BUGS
> +In order to detect available userfault features and
> +enable certain subset of those features

I changed "certain" to "some". ("certain subset" here also
would sound like "some particular subset" of those features.)
Okay?

> +the usefault file descriptor must be closed after the first
> +.BR UFFDIO_API
> +operation that queries features availability and re-opened before
> +the second
> +.BR UFFDIO_API
> +call that actually enables the desired features.
>  .SH SEE ALSO
>  .BR ioctl (2),
>  .BR mmap (2),

Cheers,

Michael



-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/