From: Arnd Bergmann <arnd@arndb.de>
To: "David S. Miller" <davem@redhat.com>
Cc: pavel@ucw.cz, hch@infradead.org, linux-kernel@vger.kernel.org
Subject: Re: ioctl cleanups: enable sg_io and serial stuff to be shared
Date: Thu, 8 May 2003 01:50:10 +0200 [thread overview]
Message-ID: <200305080150.10697.arnd@arndb.de> (raw)
In-Reply-To: <20030507.111245.25138161.davem@redhat.com>
On Wednesday 07 May 2003 20:12, David S. Miller wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> Date: Wed, 7 May 2003 21:13:07 +0200
>
> Btw: is there any bit in the ioctl number definition that can
> be (ab)used for compat_ioctl?
>
> Unfortunately no. All the bits are used in order to allow
> the size field of the encoding to be as large as possible.
I checked the numbers that are in arch/sparc64/kernel/ioctl32.o
and found none that uses more than 9 bits for the size field,
while every architecture has at least 13 bits space. There may
of course be other ioctls that can not live with 12 bit size
fields and it's probably a bad idea to require special-casing
these in the compat code.
Arnd <><
next prev parent reply other threads:[~2003-05-07 23:44 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20030507104008$12ba@gated-at.bofh.it>
2003-05-07 11:51 ` ioctl cleanups: enable sg_io and serial stuff to be shared Arnd Bergmann
2003-05-07 12:41 ` Pavel Machek
2003-05-07 12:56 ` Christoph Hellwig
2003-05-07 14:39 ` David S. Miller
2003-05-07 15:12 ` Jeff Garzik
2003-05-07 14:07 ` David S. Miller
2003-05-08 10:46 ` Gerd Knorr
2003-05-08 15:16 ` Ben Collins
2003-05-08 15:51 ` Christoph Hellwig
2003-05-08 15:37 ` Ben Collins
2003-05-08 19:34 ` Pavel Machek
2003-05-08 19:27 ` Ben Collins
2003-05-08 20:06 ` Pavel Machek
2003-05-08 19:47 ` Ben Collins
2003-05-08 20:09 ` David S. Miller
2003-05-08 20:26 ` David Mosberger
2003-05-08 20:33 ` Arjan van de Ven
2003-05-08 21:11 ` David Mosberger
2003-05-08 15:23 ` Arnd Bergmann
2003-05-07 15:28 ` Pavel Machek
2003-05-07 16:04 ` David S. Miller
2003-05-07 19:13 ` Arnd Bergmann
2003-05-07 18:12 ` David S. Miller
2003-05-07 23:50 ` Arnd Bergmann [this message]
2003-05-08 10:35 ` David S. Miller
2003-05-07 22:20 ` Alan Cox
2003-05-08 20:33 ` Pavel Machek
2003-05-08 20:43 ` David S. Miller
2003-05-08 23:03 ` Pavel Machek
2003-05-08 23:35 ` Arnd Bergmann
2003-05-08 22:48 ` Arnd Bergmann
2003-05-08 23:22 ` Pavel Machek
2003-05-07 13:18 ` Arnd Bergmann
2003-05-07 14:01 ` Carl-Daniel Hailfinger
2003-05-07 15:16 ` Pavel Machek
2003-05-07 15:46 ` Arnd Bergmann
2003-05-07 16:07 ` Jens Axboe
2003-05-07 16:20 ` Arnd Bergmann
2003-05-07 10:27 Pavel Machek
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