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Date:   Thu, 5 Nov 2020 15:21:57 -0800
From:   Martin KaFai Lau <kafai@fb.com>
To:     KP Singh <kpsingh@chromium.org>
CC:     <linux-kernel@vger.kernel.org>, <bpf@vger.kernel.org>,
        Song Liu <songliubraving@fb.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Paul Turner <pjt@google.com>, Jann Horn <jannh@google.com>,
        Hao Luo <haoluo@google.com>
Subject: Re: [PATCH bpf-next v5 5/9] bpf: Implement get_current_task_btf and
 RET_PTR_TO_BTF_ID
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 <20201105225827.2619773-6-kpsingh@chromium.org>
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On Thu, Nov 05, 2020 at 10:58:23PM +0000, KP Singh wrote:
> From: KP Singh <kpsingh@google.com>
> 
> 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 <songliubraving@fb.com>
> Signed-off-by: KP Singh <kpsingh@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>