linux-kernel - Re: [PATCH 2/3] vstatus: Add user space API definitions for VSTATUS, NOKERNINFO and TIOCSTAT

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Date:   Tue, 18 Jan 2022 09:08:41 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Walt Drummond <walt@...mmond.us>
Cc:     Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Yoshinori Sato <ysato@...rs.osdn.me>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Arnd Bergmann <arnd@...db.de>, ar@...msu.ru,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        alpha <linux-alpha@...r.kernel.org>, linux-ia64@...r.kernel.org,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
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        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 2/3] vstatus: Add user space API definitions for VSTATUS,
 NOKERNINFO and TIOCSTAT

On Tue, Jan 18, 2022 at 5:43 AM Walt Drummond <walt@...mmond.us> wrote:

> diff --git a/include/uapi/asm-generic/ioctls.h b/include/uapi/asm-generic/ioctls.h
> index cdc9f4ca8c27..eafb662d6a0e 100644
> --- a/include/uapi/asm-generic/ioctls.h
> +++ b/include/uapi/asm-generic/ioctls.h
> @@ -97,6 +97,7 @@
>
>  #define TIOCMIWAIT     0x545C  /* wait for a change on serial input line(s) */
>  #define TIOCGICOUNT    0x545D  /* read serial port inline interrupt counts */
> +#define TIOCSTAT        0x545E /* display process group stats on tty */
>
>  /*
>   * Some arches already define FIOQSIZE due to a historical

I don't see any advantage in using the old-style ioctl command definitions
here, and looking through the history of this file, all recent additions used
the now normal _IOWR() style macros, so please use those as well.

       Arnd