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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aW8vTc4mieqmJKhE@smile.fi.intel.com>
Date: Tue, 20 Jan 2026 09:31:25 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Feng Jiang <jiangfeng@...inos.cn>
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 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.

-- 
With Best Regards,
Andy Shevchenko