netdev - Re: [PATCH net-next 03/10] ipv6: np->rxpmtu race annotation

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Message-ID: <willemdebruijn.kernel.3ae4a5017999e@gmail.com>
Date: Wed, 17 Sep 2025 10:59:21 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Eric Dumazet <edumazet@...gle.com>, 
 "David S . Miller" <davem@...emloft.net>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, 
 Willem de Bruijn <willemb@...gle.com>, 
 Kuniyuki Iwashima <kuniyu@...gle.com>, 
 David Ahern <dsahern@...nel.org>, 
 netdev@...r.kernel.org, 
 eric.dumazet@...il.com, 
 Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 03/10] ipv6: np->rxpmtu race annotation

Eric Dumazet wrote:
> Add READ_ONCE() annotations because np->rxpmtu can be changed
> while udpv6_recvmsg() and rawv6_recvmsg() read it.
> 
> Since this is a very rarely used feature, and that udpv6_recvmsg()
> and rawv6_recvmsg() read np->rxopt anyway, change the test order
> so that np->rxpmtu does not need to be in a hot cache line.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>