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Thu, 5 Nov 2020 21:24:16 +0000 Date: Thu, 5 Nov 2020 13:24:10 -0800 From: Martin KaFai Lau CC: , , Song Liu , Alexei Starovoitov , Daniel Borkmann , Paul Turner , Jann Horn , Hao Luo Subject: Re: [PATCH bpf-next v4 5/9] bpf: Implement get_current_task_btf and RET_PTR_TO_BTF_ID Message-ID: <20201105212410.pngxkh6yqhhg6syc@kafai-mbp.dhcp.thefacebook.com> 0;95;0cTo: KP Singh References: <20201105144755.214341-1-kpsingh@chromium.org> <20201105144755.214341-6-kpsingh@chromium.org> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201105144755.214341-6-kpsingh@chromium.org> X-Originating-IP: [2620:10d:c090:400::5:3041] X-ClientProxiedBy: CO2PR06CA0053.namprd06.prod.outlook.com (2603:10b6:104:3::11) To BY5PR15MB3571.namprd15.prod.outlook.com (2603:10b6:a03:1f6::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from kafai-mbp.dhcp.thefacebook.com (2620:10d:c090:400::5:3041) by CO2PR06CA0053.namprd06.prod.outlook.com (2603:10b6:104:3::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3541.21 via Frontend Transport; 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(no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 05, 2020 at 03:47:51PM +0100, KP Singh wrote: > From: KP Singh > > The currently available bpf_get_current_task returns an unsigned integer > which can be used along with BPF_CORE_READ to read data from > the task_struct but still cannot be used as an input argument to a > helper that accepts an ARG_PTR_TO_BTF_ID of type task_struct. > > In order to implement this helper a new return type, RET_PTR_TO_BTF_ID, > is added. This is similar to RET_PTR_TO_BTF_ID_OR_NULL but does not > require checking the nullness of returned pointer. > > Acked-by: Song Liu > Signed-off-by: KP Singh Acked-by: Martin KaFai Lau