linux-kernel - Re: [PATCH v9 net-next 14/15] net: Reference bpf_redirect_info via task_struct on PREEMPT

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Date: Fri, 21 Jun 2024 19:08:40 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, "David S. Miller"
 <davem@...emloft.net>, Daniel Bristot de Oliveira <bristot@...nel.org>,
 Boqun Feng <boqun.feng@...il.com>, Daniel Borkmann <daniel@...earbox.net>,
 Eric Dumazet <edumazet@...gle.com>, Frederic Weisbecker
 <frederic@...nel.org>, Ingo Molnar <mingo@...hat.com>, Paolo Abeni
 <pabeni@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner
 <tglx@...utronix.de>, Waiman Long <longman@...hat.com>, Will Deacon
 <will@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko
 <andrii@...nel.org>, Eduard Zingerman <eddyz87@...il.com>, Hao Luo
 <haoluo@...gle.com>, Jesper Dangaard Brouer <hawk@...nel.org>, Jiri Olsa
 <jolsa@...nel.org>, John Fastabend <john.fastabend@...il.com>, KP Singh
 <kpsingh@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu
 <song@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Toke
 Høiland-Jørgensen <toke@...hat.com>, Yonghong Song
 <yonghong.song@...ux.dev>, bpf@...r.kernel.org
Subject: Re: [PATCH v9 net-next 14/15] net: Reference bpf_redirect_info via
 task_struct on PREEMPT_RT.

On Thu, 20 Jun 2024 15:22:04 +0200 Sebastian Andrzej Siewior wrote:
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 99076dbe27d83..f314bdd7e6108 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -2355,6 +2355,7 @@ __latent_entropy struct task_struct *copy_process(
>  	RCU_INIT_POINTER(p->bpf_storage, NULL);
>  	p->bpf_ctx = NULL;
>  #endif
> +	p->bpf_net_context =  NULL;

nit: double space after =

Out of curiosity, do we actually have to clear this pointer?