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

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Date:   Sat, 03 Sep 2016 00:44:02 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Jonathan Corbet <corbet@....net>,
        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 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>