From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D2693E173D for ; Wed, 20 May 2026 15:56:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779292571; cv=none; b=l9Ry9XdoDnb1zHOihg0QxOOvnwHvJwK6YD8YEGnO9lU2ToI2p3ALsp19j+aHm24QWn851i4+moyFtxVEHwho7F0s/ffYVM//4Wm7FS+pSjh4MG/8pPrmffwBrJbN7TK3QWNzKTsoxg3aFK7+0QyODwBDQeBV4rG2wjYPyD896RQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779292571; c=relaxed/simple; bh=5Ym8/QltKDsf0fTf7eoFv+eDys5Obz62sVInt1MWNhc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=XK8fXw/+v5LDmM5mWZsjKkz3ywJsY8lNeJtK9NlHHyTDYq7Zdt8m7fWmO7KF9tmVVTMh9UklmJXDYeuGn3ifqsYF8xlT3p371IfewAzBsDu0+mVPxM21XsQsndRSZFNLGFKMBqTbIlnCaYpv8hp02ahfwCEaD6HXC7EntKD3l1s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=GCf6Vgxm; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GCf6Vgxm" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-4891b0786beso35230265e9.1 for ; Wed, 20 May 2026 08:56:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1779292568; x=1779897368; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=HX7UJhkeQ1tHA49U1WBUw3k6TwCuDc8sNoAYzxEJmV0=; b=GCf6VgxmcPefQbt3hRQuz3Aqz+znkPTohklkNFSuBOxcXhIUsaiNAOJcEkXa86WmCt qQxG9Q+DPHL1lJapomsRuTspviHCN98qzJkSf24KTJZnUI59cBMRyaNcdqni4dzQw49W 8hfWA6w+uzF9ybBbX4QZZdZfYEGnhzQj9m+NzTcKBoOc0F4vwBGzQPHkCEYoUngAonpP fZSpj6xtYKQ5bKhltB1z2NUw2AjN67U/JCAg5ANucKMykMbyD876GCpJ/Cbi1+XkZSRK N6eIPb4f1OpsyLqZVYqheoqCfL88UF0dzzbo9ytpEqADw61gmy+0E8iGXB1Nlfk/4mHr w43w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779292568; x=1779897368; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=HX7UJhkeQ1tHA49U1WBUw3k6TwCuDc8sNoAYzxEJmV0=; b=ch3mWGW06XCTE4d+9tWMDxV9ROY1//iPRd2eFd0d6Pvco20qG5Kb8MsDhbhwDSxHkY RbKKlEy6Qpg941V5MtorazH+ohkLZzIz6kclnyUQ6ZTZRgA1CivdurVykgAKWNMIxsln J3r1nn1a25fgHm1D+Sa62T1WpFcLnN4bHvjl95inh3k51358yTCHsWta8Vm2kxy8jo1L LZ7LUEsmchp7DnwLNO1lePM9BUHdXzrG4eJZl2uBgDX1tOYwFBirIwqlyAflVRaNbqDY dDq1F+tLPe9ZhT9YW0LTV9WQ5wtFQim5xS3QrKH/mRa1ujmCSq+s+vOxvmJ/8sTGrClv 2+QQ== X-Forwarded-Encrypted: i=1; AFNElJ+nkjQNW4D0UFwbsq5gxI4YA11ZqM7NuO6+68sQ8mFLK7x/mtmSzJPm+wO7CavJdXRg2Qk2oA0b5BLHzK7KVKc=@vger.kernel.org X-Gm-Message-State: AOJu0YyFbIAGcGjM71Yu4+UqhiDphX/SLhIeNxo26m7Dgadp7FK+uTJi 7vfy4K+I/hN0lQb4tEUk1oOJOetu8QZ1a+qXHs8ZGOWQo/QAmTfxELmz X-Gm-Gg: Acq92OFyt7xHC+6rwCRVXb8j6Fqy7qO66SPQET8DwUWKEysCpXnCKnt2OjBiAl7RdBM ftUFtusmq2w4qrmA7ugECVGCOvAnrgb5WpflfkB6aM601UFLVh6ej3VPnjWFF44X2fWuwCY2eB6 3FOwXhE5aGuNBd68whR/SPSDnsP51VeUGvW1vtnfQQMbtRi0ahptNp6QJXuOxSEm7XGuZ631trM batfWxehvYGTj6gUv3g1oz+T308Aoi19EBr2VrL1bXTy6eBCWFt1T9nH081y2wtdvOztbqQ9V6P xTIce8N0SQaaG6wUqCXG6X6GFHH5u82vzvmReo6oz1ncCtivUU9EmY850EHB6rRV6MdchQapz/Q FYAijCNf1/bKPm8882tbNqiid9qyXOO9q4D+0TBtPsM6+wMqesmRI81gR9mebGAkdqRVXvqjbKc AEvk1IxetMTbDRWhbzNGhe4CpAP4Q3ZO1GKTwqfFmgTjFo7ryouXGa X-Received: by 2002:a05:600d:10:b0:48f:e230:2a21 with SMTP id 5b1f17b1804b1-48fe662fd6bmr313080955e9.32.1779292567661; Wed, 20 May 2026 08:56:07 -0700 (PDT) Received: from RTRKW671-LIN.domain.local ([89.216.37.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48feab290e1sm215565025e9.2.2026.05.20.08.56.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2026 08:56:06 -0700 (PDT) From: Milan Tripkovic To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Kees Cook Cc: Alexandre Ghiti , Andy Shevchenko , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Dusan Stojkovic , Milan Tripkovic Subject: [PATCH 0/2] riscv: lib: add optimized memchr() and extend KUnit tests Date: Wed, 20 May 2026 17:55:29 +0200 Message-ID: <20260520155532.1139471-1-milant2002@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Milan Tripkovic Add an optimized assembly implementation of memchr() for RISC-V. The implementation uses word-aligned loads and Zbb optimizations where available, with a fallback for non-Zbb hardware. The series also includes KUnit tests for functional verification and performance benchmarking. Signed-off-by: Milan Tripkovic Milan Tripkovic (2): riscv: lib: add memchr() implementation lib/string_kunit: extend benchmarks and unit test to memchr() arch/riscv/include/asm/string.h | 3 +- arch/riscv/lib/Makefile | 1 + arch/riscv/lib/memchr.S | 126 ++++++++++++++++++++++++++++++++ arch/riscv/purgatory/Makefile | 5 +- lib/tests/string_kunit.c | 53 ++++++++++++++ 5 files changed, 186 insertions(+), 2 deletions(-) create mode 100644 arch/riscv/lib/memchr.S -- 2.43.0