netdev - Re: [PATCH v3 net] net: sched: fixed barrier to prevent skbuff sticking in qdisc backlog

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Date:   Fri, 27 May 2022 04:48:33 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, edumazet@...gle.com, vray@...rayinc.com
Subject: Re: [PATCH v3 net] net: sched: fixed barrier to prevent skbuff sticking
 in qdisc backlog

Hello:

This patch was applied to bpf/bpf.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Wed, 25 May 2022 17:17:46 -0700 you wrote:
> From: Vincent Ray <vray@...rayinc.com>
> 
> In qdisc_run_begin(), smp_mb__before_atomic() used before test_bit()
> does not provide any ordering guarantee as test_bit() is not an atomic
> operation. This, added to the fact that the spin_trylock() call at
> the beginning of qdisc_run_begin() does not guarantee acquire
> semantics if it does not grab the lock, makes it possible for the
> following statement :
> 
> [...]

Here is the summary with links:
  - [v3,net] net: sched: fixed barrier to prevent skbuff sticking in qdisc backlog
    https://git.kernel.org/bpf/bpf/c/a54ce3703613

You are awesome, thank you!
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