netdev - Re: [PATCH net 6/8] ice: improve updating ice_{t, r}x_ring::xsk

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Message-ID: <20240725160700.449e5b5f@kernel.org>
Date: Thu, 25 Jul 2024 16:07:00 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>, <davem@...emloft.net>,
 <pabeni@...hat.com>, <edumazet@...gle.com>, <netdev@...r.kernel.org>,
 <magnus.karlsson@...el.com>, <aleksander.lobakin@...el.com>,
 <ast@...nel.org>, <daniel@...earbox.net>, <hawk@...nel.org>,
 <john.fastabend@...il.com>, <bpf@...r.kernel.org>, Shannon Nelson
 <shannon.nelson@....com>, Chandan Kumar Rout <chandanx.rout@...el.com>
Subject: Re: [PATCH net 6/8] ice: improve updating ice_{t,
 r}x_ring::xsk_pool

On Thu, 25 Jul 2024 20:31:31 +0200 Maciej Fijalkowski wrote:
> Does that make any sense now?

Could be brain fog due to post-netdev.conf covid but no, not really.

The _ONCE() helpers basically give you the ability to store the pointer
to a variable on the stack, and that variable won't change behind your
back. But the only reason to READ_ONCE(ptr->thing) something multiple
times is to tell KCSAN that "I know what I'm doing", it just silences
potential warnings :S