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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4B33AC19F2D for ; Tue, 9 Aug 2022 21:13:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Content-ID:In-Reply-To: References:Message-ID:Date:Subject:CC:To:From:Reply-To:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=wf5HI0maN5b61UGZcNI4nbfRf/o/IgpqmpdsiU9aVg4=; b=G/F/qgPRQxYFP2 lFJPWKEkJ26gZVw6y4I6fntOuNNEeXa1C60G1JTNOsPsooQU1OFb2cgurwdICcvz1sk9d50pBTpaE q1nxuBKX5dxP2EICHDDfQEuXBUK4gmnZYc4p2tIxlq7z9sgo7bk8ZHOg3TLIn5+NdJ/GjojtO4D9l /BTdsLO23xE9NGY+wrAeGWVU+8AgQpnN+G97//Rex6g2RVkB0k08CxhD+xoSNyXUyiH+GuhE3DpNq kb8MnrzaM4XBWw1O/9n/RuL0xAZqM0ukMYyHs4XU2rp1abRXkIFb2S2+20clnFLEigWs8A4qQbsmm mOYu2JEGajC9a4/EoB5Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oLWXX-006ZBy-K6; Tue, 09 Aug 2022 21:13:27 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oLWXL-006Z6K-T7; Tue, 09 Aug 2022 21:13:18 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1660079595; x=1691615595; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=R2eqGTq08XADGU3vAuUW+JBH8a+AX/zcHjRizXfhqgA=; b=mrKhYgipyoJbLhdgJ0SLLDuNEMFzIqEv3toLdNv+s7inDVDH02YWxrra iVjzQfZ0SZD0pVDrUBWP27bOp1rFDOndhT7z0kDRoC8seCvtl6l1bnG6M mENWh0FdVfQQdUftN6oCrhP57bDOdhivT5Zq/LLGXnV4vGB5HgNAkfq3o sd0Md5eWOECIw8MGjGEKw2eJ+wSUM62z9wXA5j6dNnlz6UbGZ79C/B6i1 4HrZtMaYjx+SM5/q1PACq7Sk+eNoxUrkdNCsa4a1GG+vNPbonz4PfEDA+ VSN+b7qZdwFRWED1mTerVUt3I/XRUa7e6FQGpAFTX/UarQjhXF9mEXvtA A==; X-IronPort-AV: E=Sophos;i="5.93,225,1654585200"; d="scan'208";a="185807837" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa1.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 09 Aug 2022 14:13:11 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Tue, 9 Aug 2022 14:13:10 -0700 Received: from NAM02-BN1-obe.outbound.protection.outlook.com (10.10.215.89) by email.microchip.com (10.10.87.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28 via Frontend Transport; Tue, 9 Aug 2022 14:13:10 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=gBRSpzdPNBgPVFChV7HJDs/F1+LdsQUzzMHcDBXsj7INg8QBMGbNAjdualbJjfvVzEoZ4gNWw0Ujjqm3mPviJYeeBbHsOyJ2SE7vzadmkH3ypQmJx98BG0bOAApvv+KJxVqttakWsEf7PwklgUIY9SOLP0HMaqhKJ5KLom6uylYfpqcbRxEpoUJ12JRdb8q44O9HLMcfdcjKB/HKdEGFfcQgLIFNEb4Ac6V5J8bRsiZyk/vBRYSnu7JXxl3d2S8lLeliY8UA5d1H1Z4IqEqPfo3chuK60wilXS8/r0fZnN6uIgoGYYoRBrXmPdJ3eMUnWeyTcpIcE+8aDelMYyMV1Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=R2eqGTq08XADGU3vAuUW+JBH8a+AX/zcHjRizXfhqgA=; b=RTGdrARJiDX2kTlC4/yA3yFwu5nDl1XxFqLLD5tq78fdOaMIJT3NRxLdc5VuZj2DXNvTRrIRzX2+tbq/HWek6ft95OjWPl8bHzrOkN90iPpINg0Hl79IXzQArrjRGcLQYTURUKC0mxlYiGKQZQlo9J2K96oqKcb6vq2ZCNF9uNvfL3QWpvVSRhVRv6z7ISf1ObLzajsUJMH24aUCmHbrNZBOK9+P5yiMl2mQUI7c8PjGqbbInjsfGILYAoEex9vGiBOAwe8HMH6EpWezkIRZnYdv0rE3ptcVh6fWIivIkbhrAohgFYMvx2H3Bax+dCSQpaJlaE7rqqw2QG6kQQ6tIA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=microchip.com; dmarc=pass action=none header.from=microchip.com; dkim=pass header.d=microchip.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microchiptechnology.onmicrosoft.com; s=selector2-microchiptechnology-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=R2eqGTq08XADGU3vAuUW+JBH8a+AX/zcHjRizXfhqgA=; b=MkSkmaqHerab71HQ5jRIlY9PEIQhbbFrjIOazDThWyL7us2f9N5iasQZAvX1Zrtr0o/CjxlQ/8t8CdbZznaFSLTl6gqg404ZE9mX+zXKYUDrEIgL8dft0gFTAdMfpZv5F+qzHL5R5UO8DWV9dqjA2sHiRfgV40aYouXD+NIXVdk= Received: from CO1PR11MB5154.namprd11.prod.outlook.com (2603:10b6:303:99::15) by DM4PR11MB5262.namprd11.prod.outlook.com (2603:10b6:5:389::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5504.14; Tue, 9 Aug 2022 21:13:05 +0000 Received: from CO1PR11MB5154.namprd11.prod.outlook.com ([fe80::ac89:75cd:26e0:51c3]) by CO1PR11MB5154.namprd11.prod.outlook.com ([fe80::ac89:75cd:26e0:51c3%8]) with mapi id 15.20.5504.020; Tue, 9 Aug 2022 21:13:05 +0000 From: To: , , , , , , , , , , , , , CC: , , , , , , , , , Subject: Re: [PATCH V5 4/6] RISC-V: Fixup getting correct current pc Thread-Topic: [PATCH V5 4/6] RISC-V: Fixup getting correct current pc Thread-Index: AQHYpmoWKDGeRD7OZEqsYpbx58+Qu62nHMwA Date: Tue, 9 Aug 2022 21:13:05 +0000 Message-ID: <3fbfaa49-8ee9-a65c-133b-d0f072f0eb6c@microchip.com> References: <20220802121818.2201268-1-xianting.tian@linux.alibaba.com> <20220802121818.2201268-5-xianting.tian@linux.alibaba.com> In-Reply-To: <20220802121818.2201268-5-xianting.tian@linux.alibaba.com> Accept-Language: en-IE, en-US Content-Language: en-IE X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microchip.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7e2267a1-f939-4957-8b94-08da7a4bf361 x-ms-traffictypediagnostic: DM4PR11MB5262:EE_ x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CO1PR11MB5154.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(39860400002)(366004)(346002)(376002)(396003)(136003)(41300700001)(26005)(921005)(2906002)(53546011)(83380400001)(6512007)(2616005)(38070700005)(38100700002)(122000001)(6506007)(316002)(6486002)(186003)(71200400001)(31686004)(91956017)(66476007)(64756008)(4326008)(8676002)(36756003)(66446008)(66946007)(76116006)(66556008)(8936002)(110136005)(54906003)(86362001)(478600001)(5660300002)(7416002)(31696002)(43740500002)(45980500001);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?VnJhMGw0bHdEYytRWDVJUnVXKzlXRDk5d3ZVTXhjeVkrUG9JWExueDlmYldm?= =?utf-8?B?TXRKb0c4NlE0K1BSb0hWKzF5dDJiZk9UNUNIRUxXTkdBdStmd2xiNG1oV1l0?= =?utf-8?B?anh5SGhoTEZpUW5PbHdtVGpFRnEzU3p3eVlKT1RoZkR0UnI3QmFPQmlvbE9G?= =?utf-8?B?TXpQTHFUdithMlIvZS9GQW9yWkpsQm43ZlNLWHlFV2ZpR0FxNUpKV1lXeHdu?= =?utf-8?B?bW0wS0ptWXZJZDdiNkZRVmZKemQwTm5YMmNQL0M1UDZmMVRac0U4MkxzaXNK?= =?utf-8?B?emlVRnJRaDdycTdWdCtOQUtndkJRYnhVRzRUNEUrYkc1Wk9URiswczhCRDQ0?= =?utf-8?B?bmlEVDZhY2VUcncxeHoyaU4rdC85VDByNE5nNXVtR2dSQkladGEvUDlmelFv?= =?utf-8?B?YlpQQm1CR3FZZlBKMHRNelVhcy9EL3Rzb2dVQWFTU2Jia2c5ODMvUjByd244?= =?utf-8?B?OFJoanhONXdJV0R1aC90QlNQdGh3Y3BiQURqQTNZTDBEdTJSNlFGcVdJbE45?= =?utf-8?B?bnVxT0RsL1VJZEJPaGNWeDNadmNBaEdhOEE5amRzWVoyeUZUc2J0OXdNZzEx?= =?utf-8?B?VVlVeG44T2NuQ1ByN0pmdVNubmEyQ0lwclU2MW5WMFBXT2dHNFhnVlU0Vyth?= =?utf-8?B?M2k4cVlUSS93Y3c4Y01aclpIV0NuUk1RSmptV1hJTTIvM0F5ZG42MnhxeFQr?= =?utf-8?B?cXd5NGgwdm53d1BhMVV0Ry9Va004R3ovNmxxWkR2MTh5V0s4bHZ5V1Bvcm1G?= =?utf-8?B?Y1FuTS95dnYzUVk1NnYzQk9Ybkc1L3JIRDJLUDJ4K1VxU1pQZnN6WFZHbll6?= =?utf-8?B?UXNVVkpHR3RTT2RWVHlOUkt1NDZES2kzSUV2VllWWmVqZGE4TUFiRHZXd0s1?= =?utf-8?B?bzlsaWVzdmI3UHNMOXg1SStaS0ZUWlRRV0c0VXdjaTNGeXRFakRxbU1DanRX?= =?utf-8?B?dUVNN3NvWmliRU5tdDVsU1NINGxKbFF4VXhRSytjWTE5MGNNRTI2dEx4Nk1G?= =?utf-8?B?TU55dTYxK3hIdmVOVjVjUkdYekkwb3lMa1phVXlFZ0c3THJ3UVFINmxOZ1Ny?= =?utf-8?B?TkFRbmVxd2UrdnlKNkNnalhFVGI4V1hPSVgvMzNmc1NIMmFrY2lPY1dJalRY?= =?utf-8?B?c1ZFczZKZTlZRnlCL1dQWDIvT1BqSEJ0ZEV1V1NMOEsrR01XMjU4cXdBeVJ4?= =?utf-8?B?TSs0NEgwZ3lKcTFpK094V0thWXVKME4xbG9GRWtoZkhZblV4QWpkczBjRmFj?= =?utf-8?B?YWxPOUFWdDRsMTBoL0xkZlJpanh4MDk3dlZnT0NNSHRoTm5NNmdBZkloclJS?= =?utf-8?B?WVdScTZIU3dpbEt6K1J5T0g0blE1KzVONVlLcU04TkFjd1JMTTF2RnNiT3c0?= =?utf-8?B?WEgwQy9SYUFjL05KMlBtM0xmeWU5RE1lZUlmNXRwVmZqcDVDMG16bDY3a3pX?= =?utf-8?B?aG40OTZIYlF2Z1cwUExSVEtKdncxVGpDdjRYQU5wRUluc2xlOThkMlQzNFVK?= =?utf-8?B?bnhRMzJtWEtQQkRmdUNacHlkSndROTZWK2dHL2ZrSXRPcGpXaWRzblhiWi84?= =?utf-8?B?MkhaOUVWdFFaNTZSc2o5STIzdWJERkE0N0U2ek1zYlRBa3N4VmZMMVdkeXRH?= =?utf-8?B?YzBJelgzeW1oK2gvSGlLTHkxdytuNUtaSHBSdW1Tcm11a1hIQS9ZQUZ6UGlm?= =?utf-8?B?WVlsVENWSTYreU1rcVJoZFVpSVpGYmVIM0llQVdLLzZLTkxrZDFUSTB2REY2?= =?utf-8?B?VW1MMkR3dGhGMzJ1YWdUYkJBYzdvMG1QMTFHZzJJZzVKVUowcUdac01QcllY?= =?utf-8?B?Y3dNdk5ZZURpZCtMWGVJdVJ4dHdKZWpObHMyTTlsKzIvUkFaRHh4MXFZUnp5?= =?utf-8?B?UVdZajdVTU1kR1hLQW1xVVFjMXRWcG4xQnd5YSs1dllmT3dya0RlZjVzalN6?= =?utf-8?B?anFJWHZ4MlQ5ODZZNUFINzBERXZWVFNFemdySjN3UUNETXRZV0x5RGF1NGJm?= =?utf-8?B?UTl6Snoyc0pVZzkxSUdjNTRkb3NKNDE1blBleHlVeHRwZmhOSUlhSG9rYnhC?= =?utf-8?B?YWVNR2grYng2YUFjMFVYc05EdXlDaVE5T2xGR3NQS1pXaHp1b0hyaTZLU283?= =?utf-8?Q?MHOnDhZFMkXGuPwSmp3clj+38?= Content-ID: <414BA810584B9C4793C814D331FD7416@namprd11.prod.outlook.com> MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CO1PR11MB5154.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7e2267a1-f939-4957-8b94-08da7a4bf361 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Aug 2022 21:13:05.0105 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: RC3v01IqREVqrRcocYGw4P/w8CEyRvFsowZjqUvyhAp75BhFQ0O1LcYtsERHjx6Eqqau3iKMppe/cya4OaxN70I0K2DkvVuUm7ZvW6Dj0KA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB5262 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220809_141315_978367_4051B63A X-CRM114-Status: GOOD ( 12.56 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 02/08/2022 13:18, Xianting Tian wrote: > When use 'echo c > /proc/sysrq-trigger' to trigger kdump, riscv_crash_save_regs() > will be called to save regs to vmcore, we found "epc" value 00ffffffa5537400 > is not a valid kernel virtual address, but is a user virtual address. Other > regs(eg, ra, sp, gp...) are correct kernel virtual address. > Actually 0x00ffffffb0dd9400 is the user mode PC of 'PID: 113 Comm: sh', which > is saved in the task's stack. > > [ 21.201701] CPU: 0 PID: 113 Comm: sh Kdump: loaded Not tainted 5.18.9 #45 > [ 21.201979] Hardware name: riscv-virtio,qemu (DT) > [ 21.202160] epc : 00ffffffa5537400 ra : ffffffff80088640 sp : ff20000010333b90 > [ 21.202435] gp : ffffffff810dde38 tp : ff6000000226c200 t0 : ffffffff8032be7c > [ 21.202707] t1 : 0720072007200720 t2 : 30203a7375746174 s0 : ff20000010333cf0 > [ 21.202973] s1 : 0000000000000000 a0 : ff20000010333b98 a1 : 0000000000000001 > [ 21.203243] a2 : 0000000000000010 a3 : 0000000000000000 a4 : 28c8f0aeffea4e00 > [ 21.203519] a5 : 28c8f0aeffea4e00 a6 : 0000000000000009 a7 : ffffffff8035c9b8 > [ 21.203794] s2 : ffffffff810df0a8 s3 : ffffffff810df718 s4 : ff20000010333b98 > [ 21.204062] s5 : 0000000000000000 s6 : 0000000000000007 s7 : ffffffff80c4a468 > [ 21.204331] s8 : 00ffffffef451410 s9 : 0000000000000007 s10: 00aaaaaac0510700 > [ 21.204606] s11: 0000000000000001 t3 : ff60000001218f00 t4 : ff60000001218f00 > [ 21.204876] t5 : ff60000001218000 t6 : ff200000103338b8 > [ 21.205079] status: 0000000200000020 badaddr: 0000000000000000 cause: 0000000000000008 > > With the incorrect PC, the backtrace showed by crash tool as below, the first > stack frame is abnormal, > > crash> bt > PID: 113 TASK: ff60000002269600 CPU: 0 COMMAND: "sh" > #0 [ff2000001039bb90] __efistub_.Ldebug_info0 at 00ffffffa5537400 <-- Abnormal > #1 [ff2000001039bcf0] panic at ffffffff806578ba > #2 [ff2000001039bd50] sysrq_reset_seq_param_set at ffffffff8038c030 > #3 [ff2000001039bda0] __handle_sysrq at ffffffff8038c5f8 > #4 [ff2000001039be00] write_sysrq_trigger at ffffffff8038cad8 > #5 [ff2000001039be20] proc_reg_write at ffffffff801b7edc > #6 [ff2000001039be40] vfs_write at ffffffff80152ba6 > #7 [ff2000001039be80] ksys_write at ffffffff80152ece > #8 [ff2000001039bed0] sys_write at ffffffff80152f46 > > With the patch, we can get current kernel mode PC, the output as below, > > [ 17.607658] CPU: 0 PID: 113 Comm: sh Kdump: loaded Not tainted 5.18.9 #42 > [ 17.607937] Hardware name: riscv-virtio,qemu (DT) > [ 17.608150] epc : ffffffff800078f8 ra : ffffffff8008862c sp : ff20000010333b90 > [ 17.608441] gp : ffffffff810dde38 tp : ff6000000226c200 t0 : ffffffff8032be68 > [ 17.608741] t1 : 0720072007200720 t2 : 666666666666663c s0 : ff20000010333cf0 > [ 17.609025] s1 : 0000000000000000 a0 : ff20000010333b98 a1 : 0000000000000001 > [ 17.609320] a2 : 0000000000000010 a3 : 0000000000000000 a4 : 0000000000000000 > [ 17.609601] a5 : ff60000001c78000 a6 : 000000000000003c a7 : ffffffff8035c9a4 > [ 17.609894] s2 : ffffffff810df0a8 s3 : ffffffff810df718 s4 : ff20000010333b98 > [ 17.610186] s5 : 0000000000000000 s6 : 0000000000000007 s7 : ffffffff80c4a468 > [ 17.610469] s8 : 00ffffffca281410 s9 : 0000000000000007 s10: 00aaaaaab5bb6700 > [ 17.610755] s11: 0000000000000001 t3 : ff60000001218f00 t4 : ff60000001218f00 > [ 17.611041] t5 : ff60000001218000 t6 : ff20000010333988 > [ 17.611255] status: 0000000200000020 badaddr: 0000000000000000 cause: 0000000000000008 > > With the correct PC, the backtrace showed by crash tool as below, > > crash> bt > PID: 113 TASK: ff6000000226c200 CPU: 0 COMMAND: "sh" > #0 [ff20000010333b90] riscv_crash_save_regs at ffffffff800078f8 <--- Normal > #1 [ff20000010333cf0] panic at ffffffff806578c6 > #2 [ff20000010333d50] sysrq_reset_seq_param_set at ffffffff8038c03c > #3 [ff20000010333da0] __handle_sysrq at ffffffff8038c604 > #4 [ff20000010333e00] write_sysrq_trigger at ffffffff8038cae4 > #5 [ff20000010333e20] proc_reg_write at ffffffff801b7ee8 > #6 [ff20000010333e40] vfs_write at ffffffff80152bb2 > #7 [ff20000010333e80] ksys_write at ffffffff80152eda > #8 [ff20000010333ed0] sys_write at ffffffff80152f52 > > Fixes: e53d28180d4d ("RISC-V: Add kdump support") This patch is also a fix, but not at the start of the series which (I think) makes it less likely to be picked up for an auto-backport. As it doesn't seem to depend on the prior patches, can you move this up to 2/6 in the series? > Co-developed-by: Guo Ren > Signed-off-by: Xianting Tian > --- > arch/riscv/kernel/crash_save_regs.S | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/riscv/kernel/crash_save_regs.S b/arch/riscv/kernel/crash_save_regs.S > index 7832fb763aba..b2a1908c0463 100644 > --- a/arch/riscv/kernel/crash_save_regs.S > +++ b/arch/riscv/kernel/crash_save_regs.S > @@ -44,7 +44,7 @@ SYM_CODE_START(riscv_crash_save_regs) > REG_S t6, PT_T6(a0) /* x31 */ > > csrr t1, CSR_STATUS > - csrr t2, CSR_EPC > + auipc t2, 0x0 > csrr t3, CSR_TVAL > csrr t4, CSR_CAUSE > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv