linux-kernel - Re: Missing a write memory barrier in tls

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Message-ID: <20231106143659.12e0d126@kernel.org>
Date:   Mon, 6 Nov 2023 14:36:59 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Dae R. Jeong" <threeearcat@...il.com>
Cc:     borisp@...dia.com, john.fastabend@...il.com, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ywchoi@...ys.kaist.ac.kr
Subject: Re: Missing a write memory barrier in tls_init()

On Thu, 2 Nov 2023 16:11:29 +0900 Dae R. Jeong wrote:
> In addition, I believe the {tls_setsockopt, tls_getsockopt}
> implementation is fine because of the address dependency. I think
> load-load reordering is prohibited in this case so we don't need a
> read barrier.

Sounds plausible, could you send a patch?

The smb_wmb() would be better placed in tls_init(), IMHO.