Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753623Ab0DAGbR (ORCPT ); Thu, 1 Apr 2010 02:31:17 -0400 Received: from terminus.zytor.com ([198.137.202.10]:45244 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753337Ab0DAGbI (ORCPT ); Thu, 1 Apr 2010 02:31:08 -0400 Message-ID: <4BB43CAC.3080102@zytor.com> Date: Wed, 31 Mar 2010 23:26:52 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 MIME-Version: 1.0 To: Andrew Morton CC: Benjamin Herrenschmidt , Christoph Lameter , Matthew Wilcox , Yinghai Lu , Rabin Vincent , lkml , penberg@cs.helsinki.fi, linux-arch@vger.kernel.org Subject: Re: start_kernel(): bug: interrupts were enabled early References: <20100325194100.GA2364@debian> <20100331134048.da4e35a7.akpm@linux-foundation.org> <4BB3B4DB.7040904@kernel.org> <20100331210145.GB32165@parisc-linux.org> <4BB3B8FC.1020608@zytor.com> <20100331211754.GC32165@parisc-linux.org> <20100331215411.GB17715@flint.arm.linux.org.uk> <4BB3C540.9000405@zytor.com> <1270075071.7101.79.camel@pasglop> <20100331154955.54176e5e.akpm@linux-foundation.org> <1270084631.7101.81.camel@pasglop> <20100331182654.d36c87ff.akpm@linux-foundation.org> In-Reply-To: <20100331182654.d36c87ff.akpm@linux-foundation.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 645 Lines: 20 On 03/31/2010 03:26 PM, Andrew Morton wrote: > > Not by adding overhead to every single down_read()/down_write() just to > fix a once-off startup problem - that's taking laziness way too far. > How much overhead is this on non-x86 architectures (keep in mind x86 doesn't use this?) -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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/