Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758913AbYCUWbL (ORCPT ); Fri, 21 Mar 2008 18:31:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753330AbYCUWa5 (ORCPT ); Fri, 21 Mar 2008 18:30:57 -0400 Received: from smtp-out02.alice-dsl.net ([88.44.60.12]:4564 "EHLO smtp-out02.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752600AbYCUWa5 (ORCPT ); Fri, 21 Mar 2008 18:30:57 -0400 To: Christoph Lameter Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86 References: <20080321061703.921169367@sgi.com> <20080321061726.782068299@sgi.com> From: Andi Kleen Date: 21 Mar 2008 23:30:54 +0100 In-Reply-To: <20080321061726.782068299@sgi.com> Message-ID: <871w63iuap.fsf@basil.nowhere.org> User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 21 Mar 2008 22:24:18.0190 (UTC) FILETIME=[4D89D2E0:01C88BA2] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 742 Lines: 14 Christoph Lameter writes: > This allows fallback for order 1 stack allocations. In the fallback > scenario the stacks will be virtually mapped. The traditional reason this was discouraged (people seem to reinvent variants of this patch all the time) was that there used to be drivers that did __pa() (or equivalent) on stack addresses and that doesn't work with vmalloc pages. I don't know if such drivers still exist, but such a change is certainly not a no-brainer -Andi -- 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/