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From: Matthias Kaehlcke <mka@chromium.org>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
	Mark Charlebois <charlebm@gmail.com>,
	Behan Webster <behanw@converseincode.com>,
	Arnd Bergmann <arnd@arndb.de>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Grant Grundler <grundler@chromium.org>,
	Michael Davidson <md@google.com>,
	Greg Hackmann <ghackmann@google.com>,
	Peter Foley <pefoley2@pefoley.com>
Subject: Re: [PATCH] fs: compat: Remove warning from COMPATIBLE_IOCTL
Date: Wed, 19 Apr 2017 11:14:12 -0700	[thread overview]
Message-ID: <20170419181412.GF128305@google.com> (raw)
In-Reply-To: <20170404180720.182336-1-mka@chromium.org>

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

> From: Mark Charlebois <charlebm@gmail.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@gmail.com>
> Signed-off-by: Mark Charlebois <charlebm@gmail.com>
> Signed-off-by: Behan Webster <behanw@converseincode.com>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
> Acked-by: Arnd Bergmann <arnd@arndb.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

  reply	other threads:[~2017-04-19 18:14 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-04 18:07 Matthias Kaehlcke
2017-04-19 18:14 ` Matthias Kaehlcke [this message]
2017-04-19 20:48   ` Arnd Bergmann
2017-04-19 21:37     ` Matthias Kaehlcke
2017-04-20  8:45       ` Arnd Bergmann
2017-04-20 19:56         ` Matthias Kaehlcke

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