linux-kernel - [PATCH 0/5] riscv: optimize string functions and add kunit tests

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Message-Id: <20260107023517.46840-1-jiangfeng@kylinos.cn>
Date: Wed,  7 Jan 2026 10:35:12 +0800
From: Feng Jiang <jiangfeng@...inos.cn>
To: pjw@...nel.org,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	kees@...nel.org,
	andy@...nel.org,
	jiangfeng@...inos.cn,
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	martin.petersen@...cle.com,
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	charlie@...osinc.com,
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	linus.walleij@...aro.org
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH 0/5] riscv: optimize string functions and add kunit tests

This series introduces optimized assembly implementations for several 
string functions on the RISC-V architecture (strnlen, strchr, and strrchr). 
To ensure correctness and prevent regressions, it also extends the 
string_kunit test suite with new cases.

The patchset is organized as follows:
- Patches 1-2: Enhance lib/string_kunit.c with new test cases for 
  strlen and strnlen to establish a baseline for verification.
- Patches 3-5: Provide the RISC-V specific optimized implementations 
  for strnlen, strchr, and strrchr.

Testing:
All patches have been verified using the KUnit framework on QEMU 
virt machine (riscv64). All string-related tests passed.

Changes:
- v1: Initial submission.

---

Feng Jiang (5):
  lib/string_kunit: add test case for strlen
  lib/string_kunit: add test case for strnlen
  riscv: lib: add strnlen implementation
  riscv: lib: add strchr implementation
  riscv: lib: add strrchr implementation

 arch/riscv/include/asm/string.h |   9 ++
 arch/riscv/lib/Makefile         |   3 +
 arch/riscv/lib/strchr.S         |  35 +++++++
 arch/riscv/lib/strnlen.S        | 164 ++++++++++++++++++++++++++++++++
 arch/riscv/lib/strrchr.S        |  37 +++++++
 arch/riscv/purgatory/Makefile   |  11 ++-
 lib/tests/string_kunit.c        |  53 +++++++++++
 7 files changed, 311 insertions(+), 1 deletion(-)
 create mode 100644 arch/riscv/lib/strchr.S
 create mode 100644 arch/riscv/lib/strnlen.S
 create mode 100644 arch/riscv/lib/strrchr.S

-- 
2.25.1