From mboxrd@z Thu Jan 1 00:00:00 1970 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org