Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269381AbUJSNCr (ORCPT ); Tue, 19 Oct 2004 09:02:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269395AbUJSNCr (ORCPT ); Tue, 19 Oct 2004 09:02:47 -0400 Received: from mx1.elte.hu ([157.181.1.137]:43195 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S269381AbUJSNCp (ORCPT ); Tue, 19 Oct 2004 09:02:45 -0400 Date: Tue, 19 Oct 2004 15:04:01 +0200 From: Ingo Molnar To: Kevin Hilman Cc: linux-kernel@vger.kernel.org, Lee Revell , Rui Nuno Capela , Mark_H_Johnson@Raytheon.com, "K.R. Foley" , Bill Huey , Adam Heath , Florian Schmidt Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U5 Message-ID: <20041019130401.GA1781@elte.hu> References: <20041012123318.GA2102@elte.hu> <20041012195424.GA3961@elte.hu> <20041013061518.GA1083@elte.hu> <20041014002433.GA19399@elte.hu> <20041014143131.GA20258@elte.hu> <20041014234202.GA26207@elte.hu> <20041015102633.GA20132@elte.hu> <20041016153344.GA16766@elte.hu> <20041018145008.GA25707@elte.hu> <83wtxmuaqm.fsf@www2.muking.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <83wtxmuaqm.fsf@www2.muking.org> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1336 Lines: 29 * Kevin Hilman wrote: > > the generic semaphore implementation (which uses rwsems) makes it > > possible to use the deadlock detection mechanism for all the mutex types > > we currently have: semaphores, rw-semaphores, spinlock-mutexes and > > rwlock-mutexes. Another benefit is that PREEMPT_REALTIME becomes much > > more portable this way. (although it's still x86-only at the moment.) > > Speaking of portability, is anyone yet working on ports to other > platforms? I'm particularily interested in ARM. i'll do x64 a couple of days after stability has been reached. I dont know of any ARM efforts though. a good starting point would be to enhance the generic-hardirqs framework for ARM. Generic-hardirqs is a portion of the PREEMPT_REALTIME patch that i've split out and submitted upstream, and which is expected to be merged into 2.6.10. The generic irq subsystem makes the irq-threading feature really simple and maintainable. So for PREEMPT_REALTIME to work on ARM the first step is to enable generic-hardirqs on ARM. (which is far from simple though.) Ingo - 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/