From linux-kernel-owner+willy=40w.ods.org-S932639AbVKXR7S@vger.kernel.org Thu Nov 24 19:00:10 2005 Return-Path: Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by mail.w.ods.org (8.13.3/8.13.3) with ESMTP id jAOI06WT004284 for ; Thu, 24 Nov 2005 19:00:08 +0100 (CET) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932639AbVKXR7S (ORCPT ); Thu, 24 Nov 2005 12:59:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161037AbVKXR7S (ORCPT ); Thu, 24 Nov 2005 12:59:18 -0500 Received: from nm02mta.dion.ne.jp ([61.117.3.75]:12305 "HELO nm02omta026.dion.ne.jp") by vger.kernel.org with SMTP id S932639AbVKXR7R (ORCPT ); Thu, 24 Nov 2005 12:59:17 -0500 Received: from [127.0.0.1] ([59.139.44.252]) by nm02mta.dion.ne.jp id <20051125025915777.MA61.8560EC8@nm02mta.dion.ne.jp>; Fri, 25 Nov 2005 02:59:15 +0900 Date: Fri, 25 Nov 2005 03:00:05 +0900 From: Akira Tsukamoto To: Ingo Molnar Subject: [PATCH 2.4] fix for clock running too fast Cc: linux-kernel@vger.kernel.org, Marcelo Tosatti In-Reply-To: <20051124144613.GC1060@elte.hu> References: <20051123035256.684C.AKIRA-T@s9.dion.ne.jp> <20051124144613.GC1060@elte.hu> Message-Id: <20051125025617.88FE.AKIRA-T@s9.dion.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.21.04 [ja] Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org Status: RO Content-Length: 1611 Lines: 52 Ingo Molnar mentioned: > > * Akira Tsukamoto wrote: > > > This one line patch adds upper bound testing inside timer_irq_works() > > when evaluating whether irq timer works or not on boot up. > > > > It fix the machines having problem with clock running too fast. > > > > What this patch do is, if timer interrupts running too fast through > > IO-APIC IRQ then false back to i8259A IRQ. > > thanks - looks good to me. > > Acked-by: Ingo Molnar > > Ingo This patch is against kernel 2.4. Signed-off-by: Akira Tsukamoto --- linux-2.4.32-atifix/arch/i386/kernel/io_apic.c.orig 2004-11-17 20:54:21.000000000 +0900 +++ linux-2.4.32-atifix/arch/i386/kernel/io_apic.c 2005-11-25 02:27:32.000000000 +0900 @@ -1194,7 +1194,7 @@ static int __init timer_irq_works(void) * might have cached one ExtINT interrupt. Finally, at * least one tick may be lost due to delays. */ - if (jiffies - t1 > 4) + if (jiffies - t1 > 4 && jiffies - t1 < 16) return 1; return 0; > - > 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/ -- Akira Tsukamoto <> - 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/