Re: [PATCH bpf] arm32, bpf: reimplement sign-extension mov instruction - patchwork-bot+netdevbpf

From: patchwork-bot+netdevbpf@kernel.org
To: Puranjay Mohan <puranjay@kernel.org>
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org,
	yonghong.song@linux.dev, john.fastabend@gmail.com,
	kpsingh@kernel.org, sdf@google.com, haoluo@google.com,
	jolsa@kernel.org, linux@armlinux.org.uk,
	rmk+kernel@armlinux.org.uk, bpf@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, puranjay12@gmail.com
Subject: Re: [PATCH bpf] arm32, bpf: reimplement sign-extension mov instruction
Date: Mon, 22 Apr 2024 15:30:28 +0000	[thread overview]
Message-ID: <171379982802.28518.11875355744954376996.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20240419182832.27707-1-puranjay@kernel.org>

Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@iogearbox.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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