Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757280AbYFXAMw (ORCPT ); Mon, 23 Jun 2008 20:12:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752792AbYFXAMm (ORCPT ); Mon, 23 Jun 2008 20:12:42 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:46108 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751722AbYFXAMl (ORCPT ); Mon, 23 Jun 2008 20:12:41 -0400 Date: Tue, 24 Jun 2008 02:12:21 +0200 From: Ingo Molnar To: Anton Vorontsov Cc: linux-serial@vger.kernel.org, Alan Cox , linux-kernel@vger.kernel.org, Thomas Gleixner , Steven Rostedt Subject: Re: [PATCH -rt] serial: 8250: fix shared interrupts issues under RT kernels Message-ID: <20080624001221.GA20685@elte.hu> References: <20080623232957.GA5111@polina.dev.rtsoft.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080623232957.GA5111@polina.dev.rtsoft.ru> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 783 Lines: 21 * Anton Vorontsov wrote: > 8250's initialization routines relies on the fact that _irqsave > spinlock will disable local hardirqs, so that the driver can issue > IRQ-triggering operations before registering the port in the IRQ > chain. > > With RT kernels and preemptable hardirqs this isn't true, _irqsave > spinlock does not disable local hardirqs, and this causes following > trace: again, please let the -rt maintainers sort out which patches need to be propagated to upstream maintainers. 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/