Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269586AbUJLJwd (ORCPT ); Tue, 12 Oct 2004 05:52:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269590AbUJLJwd (ORCPT ); Tue, 12 Oct 2004 05:52:33 -0400 Received: from mx1.elte.hu ([157.181.1.137]:21378 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S269586AbUJLJwb (ORCPT ); Tue, 12 Oct 2004 05:52:31 -0400 Date: Tue, 12 Oct 2004 11:53:39 +0200 From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Daniel Walker , "K.R. Foley" , Florian Schmidt , Fernando Pablo Lopez-Lezcano , Lee Revell , Rui Nuno Capela , Wen-chien Jesse Sung , Mark_H_Johnson@Raytheon.com Subject: Re: [patch] VP-2.6.9-rc4-mm1-T6 Message-ID: <20041012095339.GA22249@elte.hu> References: <20041011215909.GA20686@elte.hu> <20041012091501.GA18562@elte.hu> <20041012094228.GA19751@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041012094228.GA19751@elte.hu> 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: 964 Lines: 22 * Ingo Molnar wrote: > one more warning wrt. PREEMPT_REALTIME: if this option is enabled then > it is not safe to make interrupts non-threaded via > /proc/irq/*/*/threaded. If you need to turn an interrupt into a > high-prio event then its irq thread should be set to RT priority via > 'chrt'. (-T7 will turn off /proc/irq/*/*/threaded altogether, to make > sure it's not set accidentally.) in fact i've re-uploaded a new version of the -T6 patch to disable direct interrupts under PREEMPT_REALTIME kernels. The only exception is IRQ1 on PCs (the keyboard irq), which can be useful for debugging purposes (SysRq, etc.). I turned the keyboard related locks into raw spinlocks to make this safe. 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/