From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 6 Nov 2008 08:12:06 +0100 From: Ingo Molnar Subject: Re: [patch 5/7] x86_64: Support for cpu ops Message-ID: <20081106071206.GH15731@elte.hu> References: <20081105231634.133252042@quilx.com> <20081105231649.108433550@quilx.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081105231649.108433550@quilx.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: akpm@linux-foundation.org, Pekka Enberg , linux-kernel@vger.kernel.org, linux-mm@kvack.org, travis@sgi.com, Stephen Rothwell , Vegard Nossum List-ID: * Christoph Lameter wrote: > +# > +# X86_64's spare segment register points to the PDA instead of the per > +# cpu area. Therefore x86_64 is not able to generate atomic vs. interrupt > +# per cpu instructions. > +# > +config HAVE_CPU_OPS > + def_bool y > + depends on X86_32 > + hm, what happened to the rebase-PDA-to-percpu-area optimization patches you guys were working on? I remember there was some binutils flakiness - weird crashes and things like that. Did you ever manage to stabilize it? It would be sad if only 32-bit could take advantage of the optimized ops. Ingo -- 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