Re: [PATCH net-next] tcp: make smp_rmb() conditional in tcp_poll()

Hello:

This patch was applied to netdev/net-next.git (main)
by Paolo Abeni [off-list ref]:

On Sun, 13 Sep 2026 12:32:24 +0000 you wrote:

Commit a4d258036ed9 ("tcp: Fix race in tcp_poll") added smp_rmb() in
tcp_poll() and smp_wmb() in tcp_reset() (now tcp_done_with_error())
to ensure that if tcp_poll() observed socket closure, it would also
observe sk->sk_err.

Currently, tcp_poll() unconditionally executes smp_rmb() at the end
of every invocation, which on weakly-ordered architectures such as ARM64
emits a memory barrier instruction (dmb ishld) on the poll fast path,
even for healthy, active sockets.

[...]

Here is the summary with links:
  - [net-next] tcp: make smp_rmb() conditional in tcp_poll()
    https://git.kernel.org/netdev/net-next/c/e8c06b895281

You are awesome, thank you!
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