From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S275291AbTHGMNp (ORCPT ); Thu, 7 Aug 2003 08:13:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S275294AbTHGMNp (ORCPT ); Thu, 7 Aug 2003 08:13:45 -0400 Received: from pc1-cwma1-5-cust4.swan.cable.ntl.com ([80.5.120.4]:48258 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S275291AbTHGMNl convert rfc822-to-8bit (ORCPT ); Thu, 7 Aug 2003 08:13:41 -0400 Subject: Re: [RFC] new feattures to improve linux interrupt response From: Alan Cox To: Takeharu KATO Cc: Linux Kernel Mailing List , linuxppc-dev@lists.linuxppc.org In-Reply-To: <3F322919.AFFC7B6F@cs.fujitsu.co.jp> References: <3F322919.AFFC7B6F@cs.fujitsu.co.jp> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Organization: Message-Id: <1060258189.3168.34.camel@dhcp22.swansea.linux.org.uk> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.2 (1.2.2-5) Date: 07 Aug 2003 13:09:50 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Iau, 2003-08-07 at 11:25, Takeharu KATO wrote: > a)　Quick interruption handling facility for embedded systems > We are designing and implementing quick interrupt handling facility > for embedded systems. This is achieved by accepting some > interrupts(these are pre-defined in kernel configuration.) in current > Linux kernel's critical sections. > > We will modify local_irq_disable/local_irq_enable macros > to keep interrupt masks of some interrupts which need to handle quickly > un-masked in most of kernel critical sections. Thats something you can do in board specific/platform specific code and it does seem to work. I had hacks at one point doing this for the serial port on the Macintosh II.