linux-kernel - Re: [PATCH] bpf: task_group_seq_get_next: cleanup the usage of get/put_task

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Message-ID: <88ba3052-9e09-af0d-347e-2a8e8b043617@linux.dev>
Date:   Mon, 21 Aug 2023 18:06:47 -0700
From:   Yonghong Song <yonghong.song@...ux.dev>
To:     Oleg Nesterov <oleg@...hat.com>, Yonghong Song <yhs@...com>,
        Kui-Feng Lee <kuifeng@...com>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Martin KaFai Lau <martin.lau@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpf: task_group_seq_get_next: cleanup the usage of
 get/put_task_struct



On 8/21/23 1:03 PM, Oleg Nesterov wrote:
> get_pid_task() makes no sense, the code does put_task_struct() soon after.
> Use find_task_by_pid_ns() instead of find_pid_ns + get_pid_task and kill
> kill put_task_struct(), this allows to do get_task_struct() only once

remove the duplicated 'kill' in the above.

> before return.
> 
> While at it, kill the unnecessary "if (!pid)" check in the "if (!*tid)"
> block, this matches the next usage of find_pid_ns() + get_pid_task() in
> this function.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

LGTM.

Acked-by: Yonghong Song <yonghong.song@...ux.dev>