linux-kernel - Re: [RFC PATCH 8/9] ntsync: Introduce NTSYNC_IOC_PUT

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Date: Wed, 24 Jan 2024 12:03:13 -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 8/9] ntsync: Introduce NTSYNC_IOC_PUT_MUTEX.

On Wednesday, 24 January 2024 01:42:19 CST Arnd Bergmann wrote:
> On Wed, Jan 24, 2024, at 01:40, Elizabeth Figura wrote:
> > @@ -738,6 +803,8 @@ static long ntsync_char_ioctl(struct file *file, 
> > diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
> > index 26d1b3d4847f..2e44e7e77776 100644
> > --- a/include/uapi/linux/ntsync.h
> > +++ b/include/uapi/linux/ntsync.h
> > @@ -46,5 +46,7 @@ struct ntsync_wait_args {
> >  					      struct ntsync_wait_args)
> >  #define NTSYNC_IOC_CREATE_MUTEX		_IOWR(NTSYNC_IOC_BASE, 5, \
> >  					      struct ntsync_mutex_args)
> > +#define NTSYNC_IOC_PUT_MUTEX		_IOWR(NTSYNC_IOC_BASE, 6, \
> > +					      struct ntsync_mutex_args)
> > 
> 
> In your implementation, this argument is not written back to
> user space, so I think this should be _IOW rather than than _IORW.
> 
> Again, no practical difference here.

Hm, but there is a put_user() at the end of the function, or am I missing something?