linux-kernel - Re: [PATCH] doc: ioctl: Add some clarifications to botching-up-ioctls

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Message-ID: <20160906060050.0518d31a@lwn.net>
Date:   Tue, 6 Sep 2016 06:00:50 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Laura Abbott <labbott@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] doc: ioctl: Add some clarifications to
 botching-up-ioctls

On Sat, 03 Sep 2016 00:44:02 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> On Friday, September 2, 2016 3:42:24 PM CEST Laura Abbott wrote:
> > - The guide currently says to pad the structure to a multiple of
> >   64-bits. This is not necessary in cases where the structure contains
> >   no 64-bit types. Clarify this concept to avoid unnecessary padding.
> > - When using __u64 to hold user pointers, blindly trying to do a cast to
> >   a void __user * may generate a warning on 32-bit systems about a cast
> >   from an integer to a pointer of different size. There is a macro to
> >   deal with this which hides an ugly double cast. Add a reference to
> >   this macro.
> > 
> > Signed-off-by: Laura Abbott <labbott@...hat.com>
> >   
> 
> Looks good to me,
> 
> Acked-by: Arnd Bergmann <arnd@...db.de>

Applied to the docs tree, thanks.

jon