netdev - Re: [PATCH net 5/6] tcp_metrics: annotate data-races around tm->tcpm

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Date: Wed, 2 Aug 2023 09:12:24 -0600
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
 Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: Re: [PATCH net 5/6] tcp_metrics: annotate data-races around
 tm->tcpm_net

On 8/2/23 7:14 AM, Eric Dumazet wrote:
> tm->tcpm_net can be read or written locklessly.
> 
> Instead of changing write_pnet() and read_pnet() and potentially
> hurt performance, add the needed READ_ONCE()/WRITE_ONCE()
> in tm_net() and tcpm_new().
> 
> Fixes: 849e8a0ca8d5 ("tcp_metrics: Add a field tcpm_net and verify it matches on lookup")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  net/ipv4/tcp_metrics.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>