linux-kernel - Re: [PATCH] netdev: Use try_cmpxchg in napi_if_scheduled_mark

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Message-Id: <166146903519.7419.8348863262097347695.git-patchwork-notify@kernel.org>
Date:   Thu, 25 Aug 2022 23:10:35 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Uros Bizjak <ubizjak@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Subject: Re: [PATCH] netdev: Use try_cmpxchg in napi_if_scheduled_mark_missed

Hello:

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

On Mon, 22 Aug 2022 16:32:43 +0200 you wrote:
> Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in
> napi_if_scheduled_mark_missed. x86 CMPXCHG instruction returns
> success in ZF flag, so this change saves a compare after cmpxchg
> (and related move instruction in front of cmpxchg).
> 
> Also, try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg
> fails, enabling further code simplifications.
> 
> [...]

Here is the summary with links:
  - netdev: Use try_cmpxchg in napi_if_scheduled_mark_missed
    https://git.kernel.org/netdev/net-next/c/b9030780971b

You are awesome, thank you!
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