From: Christoph Hellwig <hch@infradead.org>
To: William Lee Irwin III <wli@holomorphy.com>,
alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org
Subject: Re: NUMA-Q sys_ioperm()/sys_iopl()
Date: Wed, 30 Apr 2003 13:55:21 +0100 [thread overview]
Message-ID: <20030430135521.A5383@infradead.org> (raw)
In-Reply-To: <20030430122825.GL8931@holomorphy.com>; from wli@holomorphy.com on Wed, Apr 30, 2003 at 05:28:25AM -0700
On Wed, Apr 30, 2003 at 05:28:25AM -0700, William Lee Irwin III wrote:
> NUMA-Q cannot support these operations without significant
> infrastructure to emulate a global port io space for userspace to
> manipulate, possibly even with hooks into the scheduler.
>
> Not only are the applications depending on this particular form of
> privilege elevation generally inappropriate uses of these machines
> (they are large "server-class" machines, typically shipped and run
> headless), but the devices typically managed with these interfaces
> are already explicitly unsupported in UNIX configurations.
>
> This patch removes sys_iopl() and sys_ioperm() support conditional on
> #ifdef CONFIG_X86_NUMAQ to prevent the device register corruption
> condition without significant impact on core i386 support.
Please use cond_syscall to autogenerate the stubs, and make the compilation
of /ioport.c conditional on !CONFIG_X86_NUMAQ.
next prev parent reply other threads:[~2003-04-30 12:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-30 12:28 NUMA-Q sys_ioperm()/sys_iopl() William Lee Irwin III
2003-04-30 12:55 ` Christoph Hellwig [this message]
2003-04-30 12:57 ` William Lee Irwin III
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