linux-kernel - Re: [PATCH v3 6/8] riscv: lib: add strnlen implementation

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Message-ID: <9fc6472c-b9c1-4535-b351-575604cf7ab1@kylinos.cn>
Date: Wed, 21 Jan 2026 13:52:31 +0800
From: Feng Jiang <jiangfeng@...inos.cn>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: pjw@...nel.org, palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr,
 akpm@...ux-foundation.org, kees@...nel.org, andy@...nel.org,
 ebiggers@...nel.org, martin.petersen@...cle.com, ardb@...nel.org,
 charlie@...osinc.com, conor.dooley@...rochip.com, ajones@...tanamicro.com,
 linus.walleij@...aro.org, nathan@...nel.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org, Joel Stanley <joel@....id.au>
Subject: Re: [PATCH v3 6/8] riscv: lib: add strnlen implementation

On 2026/1/20 15:31, Andy Shevchenko wrote:
> On Tue, Jan 20, 2026 at 02:58:50PM +0800, Feng Jiang wrote:
>> Add an optimized strnlen() implementation for RISC-V. This version
>> includes a generic word-at-a-time optimization and a Zbb-powered
>> optimization using the 'orc.b' instruction, derived from the strlen
>> implementation.
>>
>> Benchmark results (QEMU TCG, rv64):
>>   Length | Original (MB/s) | Optimized (MB/s) | Improvement
>>   -------|-----------------|------------------|------------
>>   16 B   | 189             | 310              | +64.0%
>>   512 B  | 344             | 1535             | +346.2%
>>   4096 B | 363             | 1854             | +410.7%
> 
>> Suggested-by: Andy Shevchenko <andy@...nel.org>
> 
> Wrong tag, I have zero knowledge about RISC V.
> 

Sorry for the confusion. I misunderstood the scope of the 'Suggested-by' tag.
I will remove it from the RISC-V specific implementation patches and only keep
relevant credits in the benchmarking/testing patches where your feedback was
applied. 

Thanks for clarifying!

-- 
With Best Regards,
Feng Jiang