From nobody Tue Feb 10 00:58:57 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5F0B3803C3; Tue, 13 Jan 2026 08:28:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768292890; cv=none; b=LeY3yK4QY2lAO2PhfnaRXfB/WEpyzODX7m2JL2IUKjvTbPtLJ41nvmlt5V3iEWj0K9ai44vbEIA6F5kfo76WflTX3K8pqFdMPB+AselG26dmjf/0gHHV8VpH0+zQ/cHPhK0YhuqHqkT+M6TuJYPcd+eRhGHUT12NPmBPrCPOcBQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768292890; c=relaxed/simple; bh=4rwKNCUClCAqHxThqil2XPf3BjWSOecFe0OTRGIbON4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=eUfzBXKDXRJTEu+B2i2n9DPcK1fnFyCQ2EqEXI7UprUDRvv+ecFNC8YhKyyruCOQiEgMlAlz02ley160TVLNq6T+On6vThrTzsGbH6TGp27NT11aJjZe/qnY5z6nSz2XWJxDrCWMf4bAokohUQYMcXa1CAqqmHg7eF2ZCRGRHKM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: c4e7f422f05911f0a38c85956e01ac42-20260113 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.6,REQID:cbb74efb-63c1-4bb7-a8f0-49e301156545,IP:0,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:-5 X-CID-META: VersionHash:a9d874c,CLOUDID:c8f361b3fbd1107a830e3721ae491ec1,BulkI D:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|850|898,TC:nil,Content:0|15|50 ,EDM:-3,IP:nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,O SA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: c4e7f422f05911f0a38c85956e01ac42-20260113 X-User: jiangfeng@kylinos.cn Received: from localhost.localdomain [(10.44.16.150)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 1597642201; Tue, 13 Jan 2026 16:27:59 +0800 From: Feng Jiang To: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, kees@kernel.org, andy@kernel.org, akpm@linux-foundation.org, jiangfeng@kylinos.cn, ebiggers@kernel.org, martin.petersen@oracle.com, ardb@kernel.org, ajones@ventanamicro.com, conor.dooley@microchip.com, samuel.holland@sifive.com, linus.walleij@linaro.org, nathan@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v2 02/14] lib/string: extract generic strnlen() into __generic_strnlen() Date: Tue, 13 Jan 2026 16:27:36 +0800 Message-Id: <20260113082748.250916-3-jiangfeng@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260113082748.250916-1-jiangfeng@kylinos.cn> References: <20260113082748.250916-1-jiangfeng@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To support performance benchmarking in KUnit tests, extract the generic C implementation of strnlen() into a standalone function __generic_strnlen(). This allows tests to compare architecture-optimized versions against the generic baseline without duplicating code. Suggested-by: Andy Shevchenko Signed-off-by: Feng Jiang --- include/linux/string.h | 1 + lib/string.c | 10 ++++++++-- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/include/linux/string.h b/include/linux/string.h index 961645633b4d..04b5fef7a4ec 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -201,6 +201,7 @@ extern __kernel_size_t __generic_strlen(const char *); #ifndef __HAVE_ARCH_STRLEN extern __kernel_size_t strlen(const char *); #endif +extern __kernel_size_t __generic_strnlen(const char *, __kernel_size_t); #ifndef __HAVE_ARCH_STRNLEN extern __kernel_size_t strnlen(const char *,__kernel_size_t); #endif diff --git a/lib/string.c b/lib/string.c index 047ecb38e09b..9dfe7177e290 100644 --- a/lib/string.c +++ b/lib/string.c @@ -430,8 +430,7 @@ size_t strlen(const char *s) EXPORT_SYMBOL(strlen); #endif =20 -#ifndef __HAVE_ARCH_STRNLEN -size_t strnlen(const char *s, size_t count) +size_t __generic_strnlen(const char *s, size_t count) { const char *sc; =20 @@ -439,6 +438,13 @@ size_t strnlen(const char *s, size_t count) /* nothing */; return sc - s; } +EXPORT_SYMBOL(__generic_strnlen); + +#ifndef __HAVE_ARCH_STRNLEN +size_t strnlen(const char *s, size_t count) +{ + return __generic_strnlen(s, count); +} EXPORT_SYMBOL(strnlen); #endif =20 --=20 2.25.1