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GET /api/patches/808653/?format=api
{ "id": 808653, "url": "http://patchwork.ozlabs.org/api/patches/808653/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-arc/patch/d2b588da61b35312a3126b605685f22bc30fc3ae.1504265945.git.joabreu@synopsys.com/", "project": { "id": 48, "url": "http://patchwork.ozlabs.org/api/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": "<d2b588da61b35312a3126b605685f22bc30fc3ae.1504265945.git.joabreu@synopsys.com>", "list_archive_url": null, "date": "2017-09-01T11:39:57", "name": "arc: Re-enable MMU upon die()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "82cab7bcb92fd6af21b9c146d52fef4d3ab812f8", "submitter": { "id": 68387, "url": "http://patchwork.ozlabs.org/api/people/68387/?format=api", "name": "Jose Abreu", "email": "Jose.Abreu@synopsys.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-arc/patch/d2b588da61b35312a3126b605685f22bc30fc3ae.1504265945.git.joabreu@synopsys.com/mbox/", "series": [ { "id": 1009, "url": "http://patchwork.ozlabs.org/api/series/1009/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-arc/list/?series=1009", "date": "2017-09-01T11:39:57", "name": "arc: Re-enable MMU upon die()", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/1009/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/808653/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/808653/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=\"kosqEL+e\"; \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 3xkHNw2Tgrz9sRV\n\tfor <incoming@patchwork.ozlabs.org>;\n\tFri, 1 Sep 2017 21:40:32 +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 1dnkJK-0001Xv-Vy; Fri, 01 Sep 2017 11:40:31 +0000", "from smtprelay4.synopsys.com ([198.182.47.9]\n\thelo=smtprelay.synopsys.com)\n\tby bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dnkJI-0001Dd-9r for linux-snps-arc@lists.infradead.org;\n\tFri, 01 Sep 2017 11:40:29 +0000", "from mailhost.synopsys.com (mailhost1.synopsys.com [10.12.238.239])\n\tby smtprelay.synopsys.com (Postfix) with ESMTP id 8A09D24E0E0A\n\tfor <linux-snps-arc@lists.infradead.org>;\n\tFri, 1 Sep 2017 04:40:05 -0700 (PDT)", "from mailhost.synopsys.com (localhost [127.0.0.1])\n\tby mailhost.synopsys.com (Postfix) with ESMTP id 70809CB9;\n\tFri, 1 Sep 2017 04:40:05 -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 4C84DC9B;\n\tFri, 1 Sep 2017 04:40:04 -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=1/dXjpwrS+3pM5hjpMvMHg2oTBcE4zKgMxKh2xK7wZQ=;\n\tb=kos\n\tqEL+e+IsF8+vIHQb9DRSltHFHIPNDdiUmbD7Gbz7QC3/un/zchIhGmXsZ1kdwLcttq9Hw1c6oaL3w\n\tgQmiHFFE84rDB8/TaUPYwvkpp+YDNvT+218uNH9JZcShVPUxUZMlkHvhlmhiHGkxD5YXZ2ecHq1C1\n\t9SOKW95IjjCyaEXhQm0R9uEz08J8+UjJQoDoYIY3sd4PO7FuvIlEH0ji585uPJxfujPlEAW00HTKR\n\trH5SgEq2iRF/rVqpdU0Jqglnl+uqtaMb4iQzdZbcIFgRvN3UUeYmnvxnRzczzMZ1dzkaDMsEMog99\n\ta+haI79jCxcclNF25cE0lceMa6zpQQw==;", "From": "Jose Abreu <Jose.Abreu@synopsys.com>", "To": "linux-snps-arc@lists.infradead.org", "Subject": "[PATCH] arc: Re-enable MMU upon die()", "Date": "Fri, 1 Sep 2017 12:39:57 +0100", "Message-Id": "<d2b588da61b35312a3126b605685f22bc30fc3ae.1504265945.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_044028_356723_93DE8E1E ", "X-CRM114-Status": "UNSURE ( 7.82 )", "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 [198.182.47.9 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 start printing the stacktrace\nmaking stacktracing of modules work upon a fatal exception.\n\nSigned-off-by: Jose Abreu <joabreu@synopsys.com>\nCc: Vineet Gupta <vgupta@synopsys.com>\nCc: Alexey Brodkin <abrodkin@synopsys.com>\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..9533e06 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@@ -30,6 +32,9 @@ void __init trap_init(void)\n \n void die(const char *str, struct pt_regs *regs, unsigned long address)\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 \tshow_kernel_fault_diag(str, regs, address);\n \n \t/* DEAD END */\n", "prefixes": [] }