Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752045Ab0ADTtc (ORCPT ); Mon, 4 Jan 2010 14:49:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752767Ab0ADTta (ORCPT ); Mon, 4 Jan 2010 14:49:30 -0500 Received: from terminus.zytor.com ([198.137.202.10]:44640 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752758Ab0ADTt3 (ORCPT ); Mon, 4 Jan 2010 14:49:29 -0500 Message-ID: <4B4245FC.7070902@zytor.com> Date: Mon, 04 Jan 2010 11:48:12 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.5) Gecko/20091209 Fedora/3.0-4.fc12 Thunderbird/3.0 MIME-Version: 1.0 To: Yinghai Lu CC: "Eric W. Biederman" , Jesse Brandeburg , Ingo Molnar , Thomas Gleixner , "linux-kernel@vger.kernel.org" , Andrew Morton , NetDEV list , Jesse Brandeburg , Suresh Siddha Subject: Re: Subject: [PATCH 1/2] x86: get back 15 vectors References: <4B347AEE.6030705@kernel.org> <20091228094707.GH24690@elte.hu> <4B398ECD.1080506@kernel.org> <4807377b1001031906s6b1ee576jc021da2642bb4147@mail.gmail.com> <4B415E73.1050801@kernel.org> <4B419113.1090204@kernel.org> <4B423B08.3010005@zytor.com> <4B424305.7050803@kernel.org> In-Reply-To: <4B424305.7050803@kernel.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1000 Lines: 28 [Adding Suresh to the Cc: list] On 01/04/2010 11:35 AM, Yinghai Lu wrote: > > so we can use [0x10, 0x1f] > > sth like this? > No!!! [0x10, 0x1f] is reserved for exceptions. We can probably get away with stealing *one* vector... presumably at the end (0x1f). However, we can absolutely not use the whole block: 0x10-0x13 is occupied by exceptions we already have OS support for (#MF, #AC, #MC, and #XM), and it's pretty much guaranteed we'll have more coming. However, growth is quite slow and since this is a kernel-internal vector (not accessible to user space) it is not creating an API. In other words, we could change FIRST_EXTERNAL_VECTOR to 0x1f, and use it for IRQ_MOVE_CLEANUP_VECTOR. Then use 0x20..0x2f for the legacy vectors. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/