netdev - [PATCH net 0/2] rfs: annotate lockless accesses

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Message-ID: <20230602163141.2115187-1-edumazet@google.com>
Date: Fri,  2 Jun 2023 16:31:39 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "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, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net 0/2] rfs: annotate lockless accesses

rfs runs without locks held, so we should annotate
read and writes to shared variables.

It should prevent compilers forcing writes
in the following situation:

  if (var != val)
     var = val;

A compiler could indeed simply avoid the conditional:

    var = val;

This matters if var is shared between many cpus.

Eric Dumazet (2):
  rfs: annotate lockless accesses to sk->sk_rxhash
  rfs: annotate lockless accesses to RFS sock flow table

 include/linux/netdevice.h |  7 +++++--
 include/net/sock.h        | 18 +++++++++++++-----
 net/core/dev.c            |  6 ++++--
 3 files changed, 22 insertions(+), 9 deletions(-)

-- 
2.41.0.rc0.172.g3f132b7071-goog