Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756885AbZJBQku (ORCPT ); Fri, 2 Oct 2009 12:40:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756689AbZJBQkt (ORCPT ); Fri, 2 Oct 2009 12:40:49 -0400 Received: from bay0-omc3-s41.bay0.hotmail.com ([65.54.246.241]:20363 "EHLO bay0-omc3-s41.bay0.hotmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756608AbZJBQkt (ORCPT ); Fri, 2 Oct 2009 12:40:49 -0400 Message-ID: X-Originating-IP: [164.116.126.146] From: Yuhong Bao To: Linus Torvalds CC: , , , , , , Subject: RE: [GIT PULL] scheduler fixes Date: Fri, 2 Oct 2009 09:40:53 -0700 Importance: Normal In-Reply-To: References: <20090928191506.40b61793@mschwide.boeblingen.de.ibm.com> <4AC10365.7090802@gmail.com> <4AC2712C.4080901@gmail.com> <20090929232248.735bf4df@infradead.org> X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1649 Lines: 34 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 > [ If I recall correctly=2C cmpxchg8b support detection was something that > was totally messed up in WNT=2C and I have this memory of TMTA _not_ > claiming to support CX8 in the cpuid bits=2C but happily supporting the > instruction itself - because otherwise WNT would blue-screen on boot or > something silly like that. Yep=2C Geoff Chappell describe this bug excellently:http://www.geoffchappel= l.com/viewer.htm?doc=3Dstudies/windows/km/cpu/cx8.htm > As a result=2C the patch below only adds CMPXCHG8B for the obvious Intel > CPU's=2C not for others. There was something really messy about cmpxchg8b > and clone CPU's=2C but I'm not 100% sure about the details=2C so take thi= s > patch with a pinch of salt=2C and some thinking ] Basically=2C pre-SP4 NT 4 would crash if the CX8 bit was set in CPUID and v= endor was not GenuineIntel=2C AuthenticAMD=2C or CyrixInstead due to a bug = in the CPU detection=2C XP had to workaround it too when it began requiring= CX8. Yuhong bao =0A= _________________________________________________________________=0A= Insert movie times and more without leaving Hotmail=AE.=0A= http://windowslive.com/Tutorial/Hotmail/QuickAdd?ocid=3DTXT_TAGLM_WL_HM_Tut= orial_QuickAdd_062009= -- 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/