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Rao" Subject: Re: [PATCH 4/4] arm64: implement KPROBES_ON_FTRACE Thread-Topic: [PATCH 4/4] arm64: implement KPROBES_ON_FTRACE Thread-Index: AQHVVoKNUq/zpqtyiEKe+wuBFBglYqcCr98AgACajgA= Date: Tue, 20 Aug 2019 02:16:28 +0000 Message-ID: <20190820100522.55bc3f42@xhacker.debian> References: <20190819192422.5ed79702@xhacker.debian> <20190819192706.46ce2c1d@xhacker.debian> <1566232996.v8nlwmnjqa.naveen@linux.ibm.com> In-Reply-To: <1566232996.v8nlwmnjqa.naveen@linux.ibm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [124.74.246.114] x-clientproxiedby: TYAPR01CA0125.jpnprd01.prod.outlook.com (2603:1096:404:2d::17) To BYAPR03MB4773.namprd03.prod.outlook.com (2603:10b6:a03:134::24) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Jisheng.Zhang@synaptics.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 566d4848-98f9-405c-5850-08d7251468a7 x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(4652040)(8989299)(5600148)(711020)(4605104)(1401327)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020); SRVR:BYAPR03MB3896; x-ms-traffictypediagnostic: BYAPR03MB3896: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-forefront-prvs: 013568035E x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(136003)(366004)(396003)(376002)(39850400004)(346002)(189003)(199004)(6506007)(386003)(316002)(7416002)(229853002)(71200400001)(71190400001)(102836004)(26005)(14454004)(6916009)(6486002)(76176011)(6436002)(1076003)(6512007)(486006)(476003)(9686003)(14444005)(52116002)(256004)(4744005)(7736002)(11346002)(54906003)(186003)(5660300002)(99286004)(305945005)(446003)(478600001)(66066001)(8936002)(25786009)(4326008)(3846002)(6116002)(81166006)(81156014)(8676002)(6246003)(2906002)(53936002)(50226002)(66476007)(64756008)(66446008)(66556008)(66946007)(86362001)(39210200001); DIR:OUT; SFP:1101; SCL:1; SRVR:BYAPR03MB3896; H:BYAPR03MB4773.namprd03.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:0; received-spf: None (protection.outlook.com: synaptics.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: 50xz/V+MdxuhdU8rdQ0+VCbgWlydRVZbPL66Tmdqq7Eo/oXA/Kq26lSMh8//f7RwCLaAagMAdxkfL2ZAejM9Bc2refH6DA4RIQK8uELpq9P8EDIzI4ynXYVfjs2gEWHBEhPl/Y97pfLFbhayquCJf4qFnhj3sEgNuRz46JkQqxcr/W+9xCNEh0YshTn6H0godBe6XYNS0en4+v84kXLYm5z+XnsRGxNNSqK4H34+3RYxT6qQo484YAsyr3QWHs1cTnfmK/kSmlXPkskc/6vQuOkIu2UYlTYJNBRxzFLHoxiZxn7vjYnkIEKmCjQ6cpiRDc56CBaFSCFk/i6yeB2vQ/FuACM/Tmxx0BsD2NmTAffO/yJa/p97iOAciTfJbrMx7pDj++aqsTDcaKLau4v9JsOyw2Rtl2qcbj/aqhLcdGs= x-ms-exchange-transport-forked: True Content-ID: MIME-Version: 1.0 X-OriginatorOrg: synaptics.com X-MS-Exchange-CrossTenant-Network-Message-Id: 566d4848-98f9-405c-5850-08d7251468a7 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Aug 2019 02:16:28.3654 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 335d1fbc-2124-4173-9863-17e7051a2a0e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: XvQOFQFDQin6lhSGmujrZnU7giJKF37UMb5vghHNu0AbuS/zbWra/9IKT3ga+876XJvKRaj6ZaXR1lACuvEcDQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR03MB3896 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190819_191632_377758_1D760EE3 X-CRM114-Status: GOOD ( 10.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Anil S Keshavamurthy , Ingo Molnar , Borislav Petkov , Masami Hiramatsu , "H. Peter Anvin" , Steven Rostedt , Thomas Gleixner , Will Deacon , "David S. Miller" , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 19 Aug 2019 22:22:12 +0530 "Naveen N. Rao" wrote: > > > Jisheng Zhang wrote: > > This patch implements KPROBES_ON_FTRACE for arm64. > > > > ~ # mount -t debugfs debugfs /sys/kernel/debug/ > > ~ # cd /sys/kernel/debug/ > > /sys/kernel/debug # echo 'p _do_fork' > tracing/kprobe_events > > > > before the patch: > > > > /sys/kernel/debug # cat kprobes/list > > ffffff801009ff7c k _do_fork+0x4 [DISABLED] > > This looks wrong -- we should not be allowing kprobe to be registered on Yes. I made a mistake when dumping this log. The kernel isn't as clean as "before the patch". > ftrace address without KPROBES_ON_FTRACE. Is _do_fork+0x4 the location > of ftrace entry on arm64? Indeed, w/o KPROBES_ON_FTRACE, it should be _do_fork+0x0 Thanks _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel