linux-kernel - Re: [RFC PATCH 1/9] ntsync: Introduce the ntsync driver and character device.

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Date: Wed, 24 Jan 2024 11:51:21 -0600
From: Elizabeth Figura <zfigura@...eweavers.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
 Arnd Bergmann <arnd@...db.de>
Cc: wine-devel@...ehq.org,
 André Almeida <andrealmeid@...lia.com>,
 Wolfram Sang <wsa@...nel.org>, Arkadiusz Hiler <ahiler@...eweavers.com>,
 Peter Zijlstra <peterz@...radead.org>
Subject:
 Re: [RFC PATCH 1/9] ntsync: Introduce the ntsync driver and character device.

On Wednesday, 24 January 2024 01:38:52 CST Arnd Bergmann wrote:
> On Wed, Jan 24, 2024, at 01:40, Elizabeth Figura wrote:
> > ntsync uses a misc device as the simplest and least intrusive uAPI interface.
> >
> > Each file description on the device represents an isolated NT instance, intended
> > to correspond to a single NT virtual machine.
> >
> > Signed-off-by: Elizabeth Figura <zfigura@...eweavers.com>
> 
> I'm looking at the ioctl interface to ensure it's well-formed.
> 
> Your patches look ok from that perspective, but there are a
> few minor things I would check for consistency here:
> 
> > +
> > +static const struct file_operations ntsync_fops = {
> > +	.owner		= THIS_MODULE,
> > +	.open		= ntsync_char_open,
> > +	.release	= ntsync_char_release,
> > +	.unlocked_ioctl	= ntsync_char_ioctl,
> > +	.compat_ioctl	= ntsync_char_ioctl,
> > +	.llseek		= no_llseek,
> > +};
> 
> The .compat_ioctl pointer should point to compat_ptr_ioctl()
> since the actual ioctl commands all take pointers instead
> of interpreting the argument as a number.
> 
> On x86 and arm64 this won't make a difference as compat_ptr()
> is a nop.

Thanks; will fix.