From nobody Tue Feb 10 09:24:53 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 4F5BE33BBD2; Fri, 30 Jan 2026 02:50:44 +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=1769741447; cv=none; b=fEUPL0snAZmrSttZ8m4S92XlLBe/2UiiZiUPaljqBHIE1q7FVxP+eC8NkU60AfbMWkhE4tYnVWg0c9Quz1iyNQQsVzF9rgtxHD2XAdamqxIQFU/IK556sNtCtMNDEHuKFSdhCnvCLK64Vmb2+q3nSMyqexLi+AQUHcH/mCPsLPc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769741447; c=relaxed/simple; bh=2jELAH6U8YzUcZRxGHu087sxUP9bTvmLOQthZ3uL3/A=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=k8rRP4PZCrUK7O/TBtPVGD8DKhs6Fj8LXboX2CGeJu0dnj5LGhekF+WmoGx/wfXKD7RLf2V8Im32pSjVPo++DRJM86bedhUt6cXt6zSOZostamHGbH7XQP0eCcn96ERhmfpZME8rABOdcm/Vi7rReRxtEn4xkO1dY8zHsNQ8u2g= 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: 744e26b4fd8611f0b0f03b4cfa9209d1-20260130 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.6,REQID:82e82b4e-ac0c-4b25-a7e4-bc67a39d08fd,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:9ef4146d6e47820315582a482cf4379e,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: 744e26b4fd8611f0b0f03b4cfa9209d1-20260130 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 1051736494; Fri, 30 Jan 2026 10:50:36 +0800 From: Feng Jiang To: palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, akpm@linux-foundation.org, kees@kernel.org, andy@kernel.org, jiangfeng@kylinos.cn, ebiggers@kernel.org, martin.petersen@oracle.com, herbert@gondor.apana.org.au, samuel.holland@sifive.com, ajones@ventanamicro.com, conor.dooley@microchip.com, charlie@rivosinc.com, nathan@kernel.org, linusw@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v7 5/8] lib/string_kunit: extend benchmarks to strnlen() and chr searches Date: Fri, 30 Jan 2026 10:50:15 +0800 Message-Id: <20260130025018.172925-6-jiangfeng@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260130025018.172925-1-jiangfeng@kylinos.cn> References: <20260130025018.172925-1-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" Extend the string benchmarking suite to include strnlen(), strchr(), and strrchr(). For character search functions strchr() and strrchr(), the benchmark targets the NUL character. This ensures the entire string is scanned, providing a consistent measure of full-length processing efficiency comparable to strlen(). Suggested-by: Andy Shevchenko Suggested-by: Eric Biggers Signed-off-by: Feng Jiang Acked-by: Andy Shevchenko Reviewed-by: Kees Cook --- lib/tests/string_kunit.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/lib/tests/string_kunit.c b/lib/tests/string_kunit.c index 5f6d0409459b..a8d430aa5466 100644 --- a/lib/tests/string_kunit.c +++ b/lib/tests/string_kunit.c @@ -866,6 +866,21 @@ static void string_bench_strlen(struct kunit *test) STRING_BENCH_BUF(test, buf, len, strlen, buf); } =20 +static void string_bench_strnlen(struct kunit *test) +{ + STRING_BENCH_BUF(test, buf, len, strnlen, buf, len); +} + +static void string_bench_strchr(struct kunit *test) +{ + STRING_BENCH_BUF(test, buf, len, strchr, buf, '\0'); +} + +static void string_bench_strrchr(struct kunit *test) +{ + STRING_BENCH_BUF(test, buf, len, strrchr, buf, '\0'); +} + static struct kunit_case string_test_cases[] =3D { KUNIT_CASE(string_test_memset16), KUNIT_CASE(string_test_memset32), @@ -892,6 +907,9 @@ static struct kunit_case string_test_cases[] =3D { KUNIT_CASE(string_test_memtostr), KUNIT_CASE(string_test_strends), KUNIT_CASE(string_bench_strlen), + KUNIT_CASE(string_bench_strnlen), + KUNIT_CASE(string_bench_strchr), + KUNIT_CASE(string_bench_strrchr), {} }; =20 --=20 2.25.1