linux-kernel - Re: [PATCH] fs: compat: Remove warning from COMPATIBLE

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Date:   Wed, 19 Apr 2017 11:14:12 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Mark Charlebois <charlebm@...il.com>,
        Behan Webster <behanw@...verseincode.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Grant Grundler <grundler@...omium.org>,
        Michael Davidson <md@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>,
        Peter Foley <pefoley2@...oley.com>
Subject: Re: [PATCH] fs: compat: Remove warning from COMPATIBLE_IOCTL

El Tue, Apr 04, 2017 at 11:07:20AM -0700 Matthias Kaehlcke ha dit:

> From: Mark Charlebois <charlebm@...il.com>
> 
> cmd in COMPATIBLE_IOCTL is always a u32, so cast it so there isn't a
> warning about an overflow in XFORM.
> 
> From: Mark Charlebois <charlebm@...il.com>
> Signed-off-by: Mark Charlebois <charlebm@...il.com>
> Signed-off-by: Behan Webster <behanw@...verseincode.com>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> ---
> Resending https://patchwork.kernel.org/patch/4961631/
> 
>  fs/compat_ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
> index 11d087b2b28e..6116d5275a3e 100644
> --- a/fs/compat_ioctl.c
> +++ b/fs/compat_ioctl.c
> @@ -833,7 +833,7 @@ static int compat_ioctl_preallocate(struct file *file,
>   */
>  #define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
>  
> -#define COMPATIBLE_IOCTL(cmd) XFORM(cmd),
> +#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
>  /* ioctl should not be warned about even if it's not implemented.
>     Valid reasons to use this:
>     - It is implemented with ->compat_ioctl on some device, but programs

Ping, any feedback on this change?

Thanks

Matthias