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

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Message-Id: <4027ec4c-1e11-40fc-a9af-07732d7c3c1a@app.fastmail.com>
Date: Wed, 24 Jan 2024 08:42:19 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Elizabeth Figura" <zfigura@...eweavers.com>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
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 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.

     Arnd