linux-kernel - Re: [PATCH bpf] arm32, bpf: reimplement sign-extension mov instruction

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Date: Mon, 22 Apr 2024 15:30:28 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Puranjay Mohan <puranjay@...nel.org>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org,
 sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org, linux@...linux.org.uk,
 rmk+kernel@...linux.org.uk, bpf@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 puranjay12@...il.com
Subject: Re: [PATCH bpf] arm32, bpf: reimplement sign-extension mov instruction

Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Fri, 19 Apr 2024 18:28:32 +0000 you wrote:
> The current implementation of the mov instruction with sign extension
> has the following problems:
> 
>   1. It clobbers the source register if it is not stacked because it
>      sign extends the source and then moves it to the destination.
>   2. If the dst_reg is stacked, the current code doesn't write the value
>      back in case of 64-bit mov.
>   3. There is room for improvement by emitting fewer instructions.
> 
> [...]

Here is the summary with links:
  - [bpf] arm32, bpf: reimplement sign-extension mov instruction
    https://git.kernel.org/bpf/bpf/c/c6f48506ba30

You are awesome, thank you!
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