linux-kernel - Re: [PATCH net-next] ptr_ring: __ptr_ring_zero

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Message-Id: 
 <175919525224.1775912.18026544343281265585.git-patchwork-notify@kernel.org>
Date: Tue, 30 Sep 2025 01:20:52 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Michael S. Tsirkin <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, jasowang@...hat.com
Subject: Re: [PATCH net-next] ptr_ring: __ptr_ring_zero_tail micro
 optimization

Hello:

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

On Sat, 27 Sep 2025 08:29:35 -0400 you wrote:
> __ptr_ring_zero_tail currently does the - 1 operation twice:
> - during initialization of head
> - at each loop iteration
> 
> Let's just do it in one place, all we need to do
> is adjust the loop condition. this is better:
> - a slightly clearer logic with less duplication
> - uses prefix -- we don't need to save the old value
> - one less - 1 operation - for example, when ring is empty
>   we now don't do - 1 at all, existing code does it once
> 
> [...]

Here is the summary with links:
  - [net-next] ptr_ring: __ptr_ring_zero_tail micro optimization
    https://git.kernel.org/netdev/net-next/c/c39d6d4d9333

You are awesome, thank you!
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