From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261927AbVG1S2N (ORCPT ); Thu, 28 Jul 2005 14:28:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262130AbVG1S0E (ORCPT ); Thu, 28 Jul 2005 14:26:04 -0400 Received: from e34.co.us.ibm.com ([32.97.110.132]:7413 "EHLO e34.co.us.ibm.com") by vger.kernel.org with ESMTP id S261863AbVG1SZ0 (ORCPT ); Thu, 28 Jul 2005 14:25:26 -0400 Subject: Re: [patch] mm: Ensure proper alignment for node_remap_start_pfn From: Dave Hansen To: Ravikiran G Thirumalai Cc: Andrew Morton , Linux Kernel Mailing List , linux-mm , shai@scalex86.org In-Reply-To: <20050728181421.GA3842@localhost.localdomain> References: <20050728004241.GA16073@localhost.localdomain> <20050727181724.36bd28ed.akpm@osdl.org> <20050728013134.GB23923@localhost.localdomain> <1122571226.23386.44.camel@localhost> <20050728181421.GA3842@localhost.localdomain> Content-Type: text/plain Date: Thu, 28 Jul 2005 11:25:22 -0700 Message-Id: <1122575122.20800.32.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2005-07-28 at 11:14 -0700, Ravikiran G Thirumalai wrote: > SRAT need not guarantee any alignment at all in the memory affinity > structure (the address in 64-bit byte address) The Summit machines (the only x86 user of the SRAT) have other hardware guarantees about alignment, so I guess that's why we've never encountered it. Are you using the SRAT on non-Summit hardware? That doesn't seem possible: arch/i386/Kconfig: config ACPI_SRAT bool default y depends on NUMA && (X86_SUMMIT || X86_GENERICARCH) > And yes, there are x86-numa > machines that run the latest kernel tree and face this problem. I didn't say "run the latest kernel tree". *In* the latest kernel tree :) -- Dave