From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=3.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_NEOMUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3460C65BAE for ; Thu, 13 Dec 2018 08:47:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 818EA2075B for ; Thu, 13 Dec 2018 08:47:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 818EA2075B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=orcon.net.nz Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727419AbeLMIrH (ORCPT ); Thu, 13 Dec 2018 03:47:07 -0500 Received: from smtp-2.orcon.net.nz ([60.234.4.43]:56038 "EHLO smtp-2.orcon.net.nz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725949AbeLMIrG (ORCPT ); Thu, 13 Dec 2018 03:47:06 -0500 X-Greylist: delayed 1251 seconds by postgrey-1.27 at vger.kernel.org; Thu, 13 Dec 2018 03:47:06 EST Received: from [121.99.228.40] (port=12898 helo=tower) by smtp-2.orcon.net.nz with esmtpa (Exim 4.86_2) (envelope-from ) id 1gXMJx-0006YS-O0; Thu, 13 Dec 2018 21:26:13 +1300 Date: Thu, 13 Dec 2018 21:26:12 +1300 From: Michael Cree To: linux-alpha@vger.kernel.org, tj@kernel.org Cc: linux-kernel@vger.kernel.org, debian-alpha@lists.debian.org Subject: Generic kernel fails to boot on Alpha bisected to b38d08f3181c Message-ID: <20181213082612.bi2dcd6uhzp3t6iq@tower> Mail-Followup-To: Michael Cree , linux-alpha@vger.kernel.org, tj@kernel.org, linux-kernel@vger.kernel.org, debian-alpha@lists.debian.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: NeoMutt/20170113 (1.7.2) X-GeoIP: NZ X-Spam_score: -2.9 X-Spam_score_int: -28 X-Spam_bar: -- Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A kernel built for generic UP Alpha had been noted to fail to boot for quite some time (since the release of 3.18). The kernel either locks up before printing any messages to the console or just falls back into the SRM with a HALT instruction again before any messages are printed to the console. A work around is to either use a kernel built for generic SMP or to build a machine specific kernel as these boot correctly. Because there were other compile errors at the time it proved difficult to bisect, but we are continuing to get complaints about it as it renders the Debian Alpha installer somewhat useless, so I returned to trying to find the problem and managed to bisect it to: commit b38d08f3181c5025a7ce84646494cc4748492a3b Author: Tejun Heo Date: Tue Sep 2 14:46:02 2014 -0400 percpu: restructure locking Any suggestions as to what might be the problem and a fix? Cheers, Michael.