Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762774AbYFDXJU (ORCPT ); Wed, 4 Jun 2008 19:09:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755500AbYFDXJG (ORCPT ); Wed, 4 Jun 2008 19:09:06 -0400 Received: from kirk.serum.com.pl ([213.77.9.205]:63481 "EHLO serum.com.pl" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757810AbYFDXJF (ORCPT ); Wed, 4 Jun 2008 19:09:05 -0400 Date: Thu, 5 Jun 2008 00:08:26 +0100 (BST) From: "Maciej W. Rozycki" To: Jon Masters cc: Stefan Assmann , "Eric W. Biederman" , Olaf Dabrunz , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/7] Boot IRQ quirks and rerouting In-Reply-To: <1212618462.8410.46.camel@londonpacket.bos.redhat.com> Message-ID: References: <12124107071847-git-send-email-od@suse.de> <4846651F.4070802@suse.de> <48467DA7.9030309@suse.de> <1212605859.8410.22.camel@londonpacket.bos.redhat.com> <1212609577.8410.32.camel@londonpacket.bos.redhat.com> <1212618462.8410.46.camel@londonpacket.bos.redhat.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 941 Lines: 23 On Wed, 4 Jun 2008, Jon Masters wrote: > *). Top level handler is *tiny*. It's job is to get called (along with > every other such function registered for a particular IRQ line) and > determine if its device generated the interrupt, and to acknowledge, > preventing the device from asserting the IRQ line any longer. > > The top part is called in hard IRQ context, even on RT. > > *). Bottom level is automatically scheduled by the kernel in response to > the top part acknowledging that its device caused the interrupt. > > The bottom part is run inside a dedicated kernel thread. I see what you mean -- well, with sane hardware that should be doable with little effort indeed. Maciej -- 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/