linux-kernel - Re: [PATCH RESEND v4 0/2] riscv: errata: thead: use riscv_nonstd_cache

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Message-Id: 
 <170498463765.20080.13600497512635410658.git-patchwork-notify@kernel.org>
Date: Thu, 11 Jan 2024 14:50:37 +0000
From: patchwork-bot+linux-riscv@...nel.org
To: Jisheng Zhang <jszhang@...nel.org>
Cc: linux-riscv@...ts.infradead.org, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v4 0/2] riscv: errata: thead: use
 riscv_nonstd_cache_ops for CMO

Hello:

This series was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <palmer@...osinc.com>:

On Tue, 14 Nov 2023 22:33:36 +0800 you wrote:
> Previously, we use alternative mechanism to dynamically patch
> the CMO operations for THEAD C906/C910 during boot for performance
> reason. But as pointed out by Arnd, "there is already a significant
> cost in accessing the invalidated cache lines afterwards, which is
> likely going to be much higher than the cost of an indirect branch".
> And indeed, there's no performance difference with GMAC and EMMC per
> my test on Sipeed Lichee Pi 4A board.
> 
> [...]

Here is the summary with links:
  - [RESEND,v4,1/2] riscv: errata: thead: use riscv_nonstd_cache_ops for CMO
    https://git.kernel.org/riscv/c/a4ff64edf9ed
  - [RESEND,v4,2/2] riscv: errata: thead: use pa based instructions for CMO
    https://git.kernel.org/riscv/c/3690492612ec

You are awesome, thank you!
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