Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754860Ab3D0J3v (ORCPT ); Sat, 27 Apr 2013 05:29:51 -0400 Received: from mail-pa0-f49.google.com ([209.85.220.49]:45282 "EHLO mail-pa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754012Ab3D0J3t (ORCPT ); Sat, 27 Apr 2013 05:29:49 -0400 Message-ID: <517B9A4D.1020502@gmail.com> Date: Sat, 27 Apr 2013 17:28:45 +0800 From: Chen Gang F T User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: Mike Qiu CC: Chen Gang , Michael Neuling , Paul Mackerras , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, sfr@canb.auug.org.au, matt@ozlabs.org, linux-kernel@vger.kernel.org, "Aneesh Kumar K.V" Subject: Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional room in exception vector area References: <5177965D.9090406@linux.vnet.ibm.com> <20130424083142.GB26834@concordia> <51779941.8080403@linux.vnet.ibm.com> <30651.1366799858@ale.ozlabs.ibm.com> <1366807638.5911.2.camel@localhost> <5178816D.3000309@asianux.com> <5178ABA2.4030109@linux.vnet.ibm.com> <20130425062539.GA421@iris.ozlabs.ibm.com> <517918AB.4020508@asianux.com> <30269.1366931768@ale.ozlabs.ibm.com> <5179D302.9060203@asianux.com> <5179D5D8.8080102@asianux.com> <5179DA23.8000407@asianux.com> <5179E056.2000709@linux.vnet.ibm.com> <5179E11F.8010007@asianux.com> <5179EFB6.3090602@linux.vnet.ibm.com> <5179F39C.5020408@asianux.com> <5179F7B8.5010701@asianux.com> <5179FA8E.9090501@linux.vnet.ibm.com> In-Reply-To: <5179FA8E.9090501@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2264 Lines: 64 On 2013年04月26日 11:54, Mike Qiu wrote: > 于 2013/4/26 11:42, Chen Gang 写道: >> On 2013年04月26日 11:25, Chen Gang wrote: >>> On 2013年04月26日 11:08, Mike Qiu wrote: >>>> 于 2013/4/26 10:06, Chen Gang 写道: >>>>> On 2013年04月26日 10:03, Mike Qiu wrote: >>>>>> �� 2013/4/26 9:36, Chen Gang д��: >>>>>>>> On 2013��04��26�� 09:18, Chen Gang wrote: >>>>>>>>>> On 2013��04��26�� 09:06, Chen Gang wrote: >>>>>>>>>>>>>> CFAR is the Come From Register. It saves the location of the >>>>>>>>>>>>>> last >>>>>>>>>>>>>>>> branch and is hence overwritten by any branch. >>>>>>>>>>>>>>>> >>>>>>>>>>>> Do we process it just like others done (e.g. 0x300, 0xe00, >>>>>>>>>>>> 0xe20 ...) ? >>>>>>>>>>>> . = 0x900 >>>>>>>>>>>> .globl decrementer_pSeries >>>>>>>>>>>> decrementer_pSeries: >>>>>>>>>>>> HMT_MEDIUM_PPR_DISCARD >>>>>>>>>>>> SET_SCRATCH0(r13) >>>>>>>>>>>> b decrementer_pSeries_0 >>>>>>>>>>>> >>>>>>>>>>>> ... >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>> Oh, it seems EXCEPTION_PROLOG_1 will save the regesters which >>>>>>>> related >>>>>>>> with CFAR, so I think need move EXCEPTION_PROLOG_1 to near 0x900. >>>>>> I will try your diff V2, to see if the machine can boot up >>>>> OK, thanks. (hope it can work) >>>> It seems that the machine can be bootup in powernv mode, but I'm not >>>> sure if my machine call that module. >>>> >>>> At lease my machine can boot up >> Please reference commit number: 1707dd161349e6c54170c88d94fed012e3d224e3 >> (1707dd1 powerpc: Save CFAR before branching in interrupt entry paths) >> >> What our diff v2 has done is just the fix for our patch v2 (just like >> the commit 1707dd1 has done). >> >> Please check, thanks. >> >> :-) > I will check this evening or tomorrow, I have something else to do this > afteroon. I think the diff v2 is correct, but is not the best one for this issue. I prefer the Paul's patch for this issue which has better performance :-) Thanks. -- Chen Gang Flying Transformer -- 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/