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GET /api/1.2/patches/808773/?format=api
{ "id": 808773, "url": "http://patchwork.ozlabs.org/api/1.2/patches/808773/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-arc/patch/d0f55ba3b94de5c1bb7c93cbadb9829fa6889fed.1504281896.git.joabreu@synopsys.com/", "project": { "id": 48, "url": "http://patchwork.ozlabs.org/api/1.2/projects/48/?format=api", "name": "Linux ARC development", "link_name": "linux-arc", "list_id": "linux-snps-arc.lists.infradead.org", "list_email": "linux-snps-arc@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<d0f55ba3b94de5c1bb7c93cbadb9829fa6889fed.1504281896.git.joabreu@synopsys.com>", "list_archive_url": null, "date": "2017-09-01T16:05:49", "name": "[v3] arc: Re-enable MMU upon a Machine Check exception", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "580b818f0be7b2fb753ad2ccb605ff3984fb7cab", "submitter": { "id": 68387, "url": "http://patchwork.ozlabs.org/api/1.2/people/68387/?format=api", "name": "Jose Abreu", "email": "Jose.Abreu@synopsys.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-arc/patch/d0f55ba3b94de5c1bb7c93cbadb9829fa6889fed.1504281896.git.joabreu@synopsys.com/mbox/", "series": [ { "id": 1058, "url": "http://patchwork.ozlabs.org/api/1.2/series/1058/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-arc/list/?series=1058", "date": "2017-09-01T16:05:49", "name": "[v3] arc: Re-enable MMU upon a Machine Check exception", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/1058/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/808773/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/808773/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "ozlabs.org; spf=none (mailfrom)\n\tsmtp.mailfrom=lists.infradead.org (client-ip=65.50.211.133;\n\thelo=bombadil.infradead.org;\n\tenvelope-from=linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=<UNKNOWN>)", "ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"Oo7AZha6\"; \n\tdkim-atps=neutral" ], "Received": [ "from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xkPHf4xgTz9sRV\n\tfor <incoming@patchwork.ozlabs.org>;\n\tSat, 2 Sep 2017 02:06:22 +1000 (AEST)", "from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dnoSb-00012u-Bj; Fri, 01 Sep 2017 16:06:21 +0000", "from smtprelay2.synopsys.com ([198.182.60.111]\n\thelo=smtprelay.synopsys.com)\n\tby bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dnoSY-00011W-EI for linux-snps-arc@lists.infradead.org;\n\tFri, 01 Sep 2017 16:06:19 +0000", "from mailhost.synopsys.com (mailhost1.synopsys.com [10.12.238.239])\n\tby smtprelay.synopsys.com (Postfix) with ESMTP id 3D9B810C1392\n\tfor <linux-snps-arc@lists.infradead.org>;\n\tFri, 1 Sep 2017 09:05:58 -0700 (PDT)", "from mailhost.synopsys.com (localhost [127.0.0.1])\n\tby mailhost.synopsys.com (Postfix) with ESMTP id 2544437A;\n\tFri, 1 Sep 2017 09:05:58 -0700 (PDT)", "from joabreu-VirtualBox.internal.synopsys.com\n\t(joabreu-e7440.internal.synopsys.com [10.107.19.75])\n\tby mailhost.synopsys.com (Postfix) with ESMTP id 0A2EB35E;\n\tFri, 1 Sep 2017 09:05:56 -0700 (PDT)" ], "DKIM-Signature": "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20170209; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe:\n\tList-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date:\n\tSubject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date:\n\tResent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:\n\tReferences:List-Owner; bh=12yuog4IENi67Yoi1TwA2YEomoHXATj0btbZUWIAQAs=;\n\tb=Oo7\n\tAZha6GASWd3nONljoOVM2V1efG+2Knbwz6oGKQ+zm43TG6B5mNLnueaiRvVHWAysUFycBO5v9i0ry\n\tBtp2hbnCyXJs7+HMHNVsYpfr6pL8XA5r3MlX+c/77V4ugexZoH2LTkOllqUVBnnszXbIEqUQIvU+T\n\tpz1h+cob7wcQ8WYFxbu6bqYTPzSy1HgVWbO7tEi3UqCQeucVk+lD9GlxlxcRIGQsvnHHIGRhg5e1V\n\t03AdBjfGQfAiO9M7uP9xr63TV4ZTZvcojTvUkS1OMPXC4rO62IzOLbe2HNQFOLcUYIBX8MqCbpjex\n\t0tcWpXevo9u5OxX+l8fBna2+1AI36kQ==;", "From": "Jose Abreu <Jose.Abreu@synopsys.com>", "To": "linux-snps-arc@lists.infradead.org", "Subject": "[PATCH v3] arc: Re-enable MMU upon a Machine Check exception", "Date": "Fri, 1 Sep 2017 17:05:49 +0100", "Message-Id": "<d0f55ba3b94de5c1bb7c93cbadb9829fa6889fed.1504281896.git.joabreu@synopsys.com>", "X-Mailer": "git-send-email 1.9.1", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20170901_090618_497634_0725BD20 ", "X-CRM114-Status": "UNSURE ( 7.93 )", "X-CRM114-Notice": "Please train this message.", "X-Spam-Score": "-1.9 (-)", "X-Spam-Report": "SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-1.9 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/,\n\tno trust [198.182.60.111 listed in list.dnswl.org]\n\t-0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay\n\tdomain\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]", "X-BeenThere": "linux-snps-arc@lists.infradead.org", "X-Mailman-Version": "2.1.21", "Precedence": "list", "List-Id": "Linux on Synopsys ARC Processors\n\t<linux-snps-arc.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/linux-snps-arc>, \n\t<mailto:linux-snps-arc-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/linux-snps-arc/>", "List-Post": "<mailto:linux-snps-arc@lists.infradead.org>", "List-Help": "<mailto:linux-snps-arc-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/linux-snps-arc>, \n\t<mailto:linux-snps-arc-request@lists.infradead.org?subject=subscribe>", "Cc": "Jose Abreu <Jose.Abreu@synopsys.com>,\n\tVineet Gupta <Vineet.Gupta1@synopsys.com>,\n\tAlexey Brodkin <Alexey.Brodkin@synopsys.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"linux-snps-arc\" <linux-snps-arc-bounces@lists.infradead.org>", "Errors-To": "linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "I recently came upon a scenario where I would get a double fault\nafter a machine check error. It turns out that for Ksymbol lookup\nto work with modules we need to have MMU enabled because module\naddress is mapped in the cached space.\n\nThis patch re-enables the MMU before calling die() so that\nstacktracing of modules work when a machine check exception happens.\n\nSigned-off-by: Jose Abreu <joabreu@synopsys.com>\nCc: Vineet Gupta <vgupta@synopsys.com>\nCc: Alexey Brodkin <abrodkin@synopsys.com>\n\nChanges from v2:\n\t- Rephrased commit title and description\nChanges from v1:\n\t- Moved MMU re-enable to machine check exception handler\n---\n arch/arc/kernel/traps.c | 5 +++++\n 1 file changed, 5 insertions(+)", "diff": "diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c\nindex ff83e78..d92f161 100644\n--- a/arch/arc/kernel/traps.c\n+++ b/arch/arc/kernel/traps.c\n@@ -19,6 +19,8 @@\n #include <linux/ptrace.h>\n #include <linux/kprobes.h>\n #include <linux/kgdb.h>\n+#include <asm/arcregs.h>\n+#include <asm/mmu.h>\n #include <asm/setup.h>\n #include <asm/unaligned.h>\n #include <asm/kprobes.h>\n@@ -103,6 +105,9 @@ int do_misaligned_access(unsigned long address, struct pt_regs *regs,\n */\n void do_machine_check_fault(unsigned long address, struct pt_regs *regs)\n {\n+\t/* MMU must be enabled for Ksymbol lookup in modules */\n+\twrite_aux_reg(ARC_REG_PID, MMU_ENABLE | read_aux_reg(ARC_REG_PID));\n+\n \tdie(\"Machine Check Exception\", regs, address);\n }\n \n", "prefixes": [ "v3" ] }