linux-kernel - Re: [PATCH net-next] u64_stats: Disable preemption on 32bit UP+SMP PREEMPT

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Message-Id: <163939980990.30215.13552444074431867461.git-patchwork-notify@kernel.org>
Date:   Mon, 13 Dec 2021 12:50:09 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        peterz@...radead.org, tglx@...utronix.de, kuba@...nel.org,
        davem@...emloft.net
Subject: Re: [PATCH net-next] u64_stats: Disable preemption on 32bit UP+SMP
 PREEMPT_RT during updates.

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@...emloft.net>:

On Fri, 10 Dec 2021 21:29:59 +0100 you wrote:
> On PREEMPT_RT the seqcount_t for synchronisation is required on 32bit
> architectures even on UP because the softirq (and the threaded IRQ handler) can
> be preempted.
> 
> With the seqcount_t for synchronisation, a reader with higher priority can
> preempt the writer and then spin endlessly in read_seqcount_begin() while the
> writer can't make progress.
> 
> [...]

Here is the summary with links:
  - [net-next] u64_stats: Disable preemption on 32bit UP+SMP PREEMPT_RT during updates.
    https://git.kernel.org/netdev/net-next/c/3c118547f87e

You are awesome, thank you!
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