From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261849AbULJWz7 (ORCPT ); Fri, 10 Dec 2004 17:55:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261856AbULJWz7 (ORCPT ); Fri, 10 Dec 2004 17:55:59 -0500 Received: from fw.osdl.org ([65.172.181.6]:5252 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S261849AbULJWz5 (ORCPT ); Fri, 10 Dec 2004 17:55:57 -0500 Date: Fri, 10 Dec 2004 14:55:39 -0800 (PST) From: Linus Torvalds To: Alan Cox cc: Pavel Pisa , Ingo Molnar , Linux Kernel Mailing List , trivial@rustcorp.com.au Subject: Re: VM86 interrupt emulation breakage and FIXes for 2.6.x kernel series In-Reply-To: <1102712732.3264.73.camel@localhost.localdomain> Message-ID: References: <200412091459.51583.pisa@cmp.felk.cvut.cz> <1102712732.3264.73.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 10 Dec 2004, Alan Cox wrote: > > You can't disable_irq and return to user space - the IRQ may be shared > by a device needed to make user space progress. The vm86 interrupt does not allow sharing. And it really _has_ to be disabled until user mode has cleared the irq source, or you'll have a very dead machine. Linus