From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 21 Mar 2008 10:40:18 -0700 (PDT) From: Christoph Lameter Subject: Re: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86 In-Reply-To: <20080321.002502.223136918.davem@davemloft.net> Message-ID: References: <20080321061703.921169367@sgi.com> <20080321061726.782068299@sgi.com> <20080321.002502.223136918.davem@davemloft.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: David Miller Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Fri, 21 Mar 2008, David Miller wrote: > I would be very careful with this especially on IA64. > > If the TLB miss or other low-level trap handler depends upon being > able to dereference thread info, task struct, or kernel stack stuff > without causing a fault outside of the linear PAGE_OFFSET area, this > patch will cause problems. Hmmm. Does not sound good for arches that cannot handle TLB misses in hardware. I wonder how arch specific this is? Last time around I was told that some arches already virtually map their stacks. -- 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