Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755525Ab0G1QG4 (ORCPT ); Wed, 28 Jul 2010 12:06:56 -0400 Received: from terminus.zytor.com ([198.137.202.10]:51593 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752785Ab0G1QGy (ORCPT ); Wed, 28 Jul 2010 12:06:54 -0400 Message-ID: <4C50556B.6020301@zytor.com> Date: Wed, 28 Jul 2010 09:06:03 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100720 Fedora/3.1.1-1.fc13 Thunderbird/3.1.1 MIME-Version: 1.0 To: Yinghai Lu CC: Benjamin Herrenschmidt , Ingo Molnar , Thomas Gleixner , Andrew Morton , David Miller , Linus Torvalds , Johannes Weiner , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [PATCH 31/31] memblock: Add memblock_find_in_range() References: <1279822864-17154-1-git-send-email-yinghai@kernel.org> <1279822864-17154-32-git-send-email-yinghai@kernel.org> <1280295415.1970.245.camel@pasglop> <4C4FC95F.6040806@kernel.org> <4C4FD04B.5090503@zytor.com> <4C4FD85C.2090603@kernel.org> In-Reply-To: <4C4FD85C.2090603@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1179 Lines: 30 On 07/28/2010 12:12 AM, Yinghai Lu wrote: > > the problem is later if the user hit the problem, it will be called "Regression" after bisecting to the memblock/x86 changes. > because low/high does work before. > > BTW, that design from qlogic to save log in RAM is not good one, they may save some cents for the ram in card. > > other vendors seems put log/trace in the ram on card. > It's broken NOW. The only reason it's not exploding is by accident. The fact that you knew about the problem and had the notion of working around it instead of fixing the root cause by either fixing or blacklisting the broken driver is disgusting beyond belief. Either the driver needs to map the memory off limit in the e820 map passed to kexec, or better yet it should have its DMA disabled across kexec. I'm truly appalled. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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/