linux-kernel - Re: [PATCH] spi: spidev: Add 32 bit compat ioctl()

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Date:	Tue, 1 Feb 2011 21:39:44 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Bernhard Walle <walle@...science.de>, arnd@...db.de
Cc:	dbrownell@...rs.sourceforge.net,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] spi: spidev: Add 32 bit compat ioctl()

On Tue, Feb 01, 2011 at 10:02:46AM +0100, Bernhard Walle wrote:
> Add the compat_ioctl for operations on /dev/spi* so that 32 bit
> userspace applications can access SPI. As far as I can see all data
> structure are already prepared for that, so no additional conversion has
> to be done.
> 
> My use case is MIPS with N32 userspace ABI and toolchain, and that was
> also the platform where I tested it successfully (Cavium Octeon).
> 
> Signed-off-by: Bernhard Walle <walle@...science.de>

Arnd, can you please give your opinion on this one?  I haven't fully
got my head around the subtleties of 32/64 bit file_operations.

Thanks,
g.

> ---
>  drivers/spi/spidev.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
> index 4e6245e..bb24ad8 100644
> --- a/drivers/spi/spidev.c
> +++ b/drivers/spi/spidev.c
> @@ -543,6 +543,7 @@ static const struct file_operations spidev_fops = {
>  	.write =	spidev_write,
>  	.read =		spidev_read,
>  	.unlocked_ioctl = spidev_ioctl,
> +	.compat_ioctl = spidev_ioctl,
>  	.open =		spidev_open,
>  	.release =	spidev_release,
>  	.llseek =	no_llseek,
> -- 
> 1.7.1
> 
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