linux-kernel - Re: [PATCH] compat_ioctl: Supress "unknown cmd" message on serial /dev/console

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Message-Id: <201001160902.40931.arnd@arndb.de>
Date:	Sat, 16 Jan 2010 09:02:40 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	"Greg Kroah-Hartman" <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] compat_ioctl: Supress "unknown cmd" message on serial /dev/console

On Sunday 10 January 2010, Atsushi Nemoto wrote:
> After the commit fb07a5f8 ("compat_ioctl: remove all VT ioctl
> handling"), I got this error message on 64-bit mips kernel with 32-bit
> busybox userland:
> 
> ioctl32(init:1): Unknown cmd fd(0) cmd(00005600){t:'V';sz:0} arg(7fd76480) on /dev/console
> 
> The cmd 5600 is VT_OPENQRY.  The busybox's init issues this ioctl to
> know vt-console or serial-console.  If the console was serial console,
> VT ioctls are not handled by the serial driver.
> 
> And by quick search, I found some programs using VT_GETMODE to check
> vt-console is available or not.
> 
> Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>

Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks for adding it to your tree, Greg. I'm a bit slow on
email currently, as I'm travelling.

	Arnd
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