linux-kernel - Re: [PATCH v3] riscv, bpf: Optimize zextw insn with Zba extension

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Message-ID: <20240516-0ec6ff4ad0e23302003be51a@orel>
Date: Thu, 16 May 2024 14:38:28 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Xiao Wang <xiao.w.wang@...el.com>
Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, 
	luke.r.nels@...il.com, xi.wang@...il.com, bjorn@...nel.org, 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-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
	pulehui@...wei.com, haicheng.li@...el.com, conor@...nel.org, 
	ben.dooks@...ethink.co.uk
Subject: Re: [PATCH v3] riscv, bpf: Optimize zextw insn with Zba extension

On Thu, May 16, 2024 at 05:04:30PM GMT, Xiao Wang wrote:
> The Zba extension provides add.uw insn which can be used to implement
> zext.w with rs2 set as ZERO.
> 
> Signed-off-by: Xiao Wang <xiao.w.wang@...el.com>
> ---
> v3:
> * Remove the Kconfig dependencies on TOOLCHAIN_HAS_ZBA and
>   RISCV_ALTERNATIVE. (Andrew)
> v2:
> * Add Zba description in the Kconfig. (Lehui)
> * Reword the Kconfig help message to make it clearer. (Conor)
> ---
>  arch/riscv/Kconfig       | 12 ++++++++++++
>  arch/riscv/net/bpf_jit.h | 18 ++++++++++++++++++
>  2 files changed, 30 insertions(+)
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>