From nobody Wed Oct 8 00:59:09 2025 Received: from outbound.pv.icloud.com (p-west1-cluster2-host6-snip4-4.eps.apple.com [57.103.64.225]) (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 E06A12FCE23 for ; Fri, 4 Jul 2025 13:28:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=57.103.64.225 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751635718; cv=none; b=Muc1djkdBlVtyQsS0vyrUIJM/9gnl7j/+bIureZgBgijb/yxvQirJjA7FawYDCo0RbxqufmoDpceDujpa/J1k1kdxv4CqJYXoKOjK9JjBkxpYzC4k59aacvpPO1w1kMIvkfjg5W2IShoP7S86TJCPqWNtZPrhu95xbEz/9yHN6s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751635718; c=relaxed/simple; bh=FyJgHYQRSike9Y5he0/tpJNQq216KNkAke3W74dkf/A=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=iLheraANN2az4U3SXXvBLbpccchludjlZ0nKUxnujw6Mic92OGGnmSb7Wj1EL4CY8eOz6LVXqen1ctkGZ6puy/2goIxFby7oaIKupJe8J0ALDyKUornDmVtu7JT1VfbydKR4lHIW9ZaeiSYS7XO6cgmsj85afWv7+f/nfd6A3gs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com; spf=pass smtp.mailfrom=icloud.com; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b=hwIWUw5e; arc=none smtp.client-ip=57.103.64.225 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=icloud.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b="hwIWUw5e" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=icloud.com; s=1a1hai; bh=img6kI6qDl6d+Oujtn4iBGfny39yRj7iBTcBIlKJQeY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:x-icloud-hme; b=hwIWUw5eIttHHn6SlckAPoGLnGid9pk1D8wkIUlg1ev7LFYnK8vGsDcBbHi4WmBta Oe8Nu/bWCuaj7kNYq5W995OE6K/dDYbxXiDOcWxw/DXXl3xwbwEZtSZudmgK+RWnH3 YozJbrMwhh2XnyDVWQRfcrxUCjzcbUCbmGr+GVEC0oiN09kFzDAf6Ux4Uh0WwATp1A 9Ud5VDjRHhKrmJh500lGdBvxa1ITZARcTy+U+7aIXEmvvlGmGUZwa3xMA3sGEDoJ4q akO88MXcK6Fg4kw8M6IJ/HdmJD9xae+8DpQfYoXf35COEQDtdLAeKLD/bsRCc4w9Ym wvbvs3pk6Ewig== Received: from outbound.pv.icloud.com (unknown [127.0.0.2]) by outbound.pv.icloud.com (Postfix) with ESMTPS id A793D18028D0; Fri, 4 Jul 2025 13:28:34 +0000 (UTC) Received: from [192.168.1.26] (pv-asmtp-me-k8s.p00.prod.me.com [17.56.9.36]) by outbound.pv.icloud.com (Postfix) with ESMTPSA id F13E818034AC; Fri, 4 Jul 2025 13:26:22 +0000 (UTC) From: Zijun Hu Date: Fri, 04 Jul 2025 21:26:00 +0800 Subject: [PATCH v4 2/8] char: misc: Adapt and add test cases for simple minor space division Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250704-rfc_miscdev-v4-2-b48986112d6a@oss.qualcomm.com> References: <20250704-rfc_miscdev-v4-0-b48986112d6a@oss.qualcomm.com> In-Reply-To: <20250704-rfc_miscdev-v4-0-b48986112d6a@oss.qualcomm.com> To: Arnd Bergmann , Greg Kroah-Hartman , "James E.J. Bottomley" , Helge Deller , "David S. Miller" , Andreas Larsson Cc: Thadeu Lima de Souza Cascardo , Zijun Hu , linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, Zijun Hu X-Mailer: b4 0.14.2 X-Proofpoint-ORIG-GUID: zl6owmPiKTNPw4jds7YKolxY1DqlDDF2 X-Proofpoint-GUID: zl6owmPiKTNPw4jds7YKolxY1DqlDDF2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzA0MDEwMiBTYWx0ZWRfX8bLbqYpxR1vV 5Ta9LhdBJfygfVTQxFX6u6C2VnafhCoU32EX+n8Gj17TT+vY0R1zx6VK6nEe0ZhPp8PYJu+MvSf LHBkzr/sgv5PEIVa7aJaGbRMCRx6mb4YvLEpYsfNB/SXU/g/aLf9o07l4Tr4aHe0Y+QaO/RfzLP r4qXHkPjBgCg6fJLhXSXf/0Vyn+r1mOj6Bn1EIAOlKPnEDF7CowTrC+kFbiWIyn3y0NihRs5qSH T4eA2kgWXFRzjR1lxzuyEDbQa37//dF4xVk/twPt0XcU+xZo+aMFImUKtVKWPO02ExslQvA3Y= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-04_05,2025-07-04_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 clxscore=1015 phishscore=0 suspectscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.22.0-2506060001 definitions=main-2507040102 From: Zijun Hu Adapt and add test cases for next change which Regards minor which > MISC_DYNAMIC_MINOR as invalid parameter when register miscdevice, hence get a simple minor space division below: |< 255 : Fixed minor code |=3D=3D 255 : Indicator to request dynamic minor code |> 255 : Dynamic minor code requested, 1048320 minor codes totally. Signed-off-by: Zijun Hu --- drivers/char/misc_minor_kunit.c | 51 +++++++++++++++++--------------------= ---- 1 file changed, 21 insertions(+), 30 deletions(-) diff --git a/drivers/char/misc_minor_kunit.c b/drivers/char/misc_minor_kuni= t.c index 30eceac5f1b6402b0f918af6f56602ed1a6c14ec..3184f383bea8c77cbca69ff5e31= 5ea5de2d5512e 100644 --- a/drivers/char/misc_minor_kunit.c +++ b/drivers/char/misc_minor_kunit.c @@ -7,12 +7,6 @@ #include #include =20 -/* dynamic minor (2) */ -static struct miscdevice dev_dynamic_minor =3D { - .minor =3D 2, - .name =3D "dev_dynamic_minor", -}; - /* static minor (LCD_MINOR) */ static struct miscdevice dev_static_minor =3D { .minor =3D LCD_MINOR, @@ -25,16 +19,6 @@ static struct miscdevice dev_misc_dynamic_minor =3D { .name =3D "dev_misc_dynamic_minor", }; =20 -static void kunit_dynamic_minor(struct kunit *test) -{ - int ret; - - ret =3D misc_register(&dev_dynamic_minor); - KUNIT_EXPECT_EQ(test, 0, ret); - KUNIT_EXPECT_EQ(test, 2, dev_dynamic_minor.minor); - misc_deregister(&dev_dynamic_minor); -} - static void kunit_static_minor(struct kunit *test) { int ret; @@ -157,13 +141,7 @@ static bool is_valid_dynamic_minor(int minor) { if (minor < 0) return false; - if (minor =3D=3D MISC_DYNAMIC_MINOR) - return false; - if (minor >=3D 0 && minor <=3D 15) - return false; - if (minor >=3D 128 && minor < MISC_DYNAMIC_MINOR) - return false; - return true; + return minor > MISC_DYNAMIC_MINOR; } =20 static int miscdev_test_open(struct inode *inode, struct file *file) @@ -557,7 +535,7 @@ static void __init miscdev_test_conflict(struct kunit *= test) */ miscstat.minor =3D miscdyn.minor; ret =3D misc_register(&miscstat); - KUNIT_EXPECT_EQ(test, ret, -EBUSY); + KUNIT_EXPECT_EQ(test, ret, -EINVAL); if (ret =3D=3D 0) misc_deregister(&miscstat); =20 @@ -590,8 +568,9 @@ static void __init miscdev_test_conflict_reverse(struct= kunit *test) misc_deregister(&miscdyn); =20 ret =3D misc_register(&miscstat); - KUNIT_EXPECT_EQ(test, ret, 0); - KUNIT_EXPECT_EQ(test, miscstat.minor, miscdyn.minor); + KUNIT_EXPECT_EQ(test, ret, -EINVAL); + if (ret =3D=3D 0) + misc_deregister(&miscstat); =20 /* * Try to register a dynamic minor after registering a static minor @@ -601,20 +580,32 @@ static void __init miscdev_test_conflict_reverse(stru= ct kunit *test) miscdyn.minor =3D MISC_DYNAMIC_MINOR; ret =3D misc_register(&miscdyn); KUNIT_EXPECT_EQ(test, ret, 0); - KUNIT_EXPECT_NE(test, miscdyn.minor, miscstat.minor); + KUNIT_EXPECT_EQ(test, miscdyn.minor, miscstat.minor); KUNIT_EXPECT_TRUE(test, is_valid_dynamic_minor(miscdyn.minor)); if (ret =3D=3D 0) misc_deregister(&miscdyn); +} =20 - miscdev_test_can_open(test, &miscstat); +/* Take minor(> MISC_DYNAMIC_MINOR) as invalid when register miscdevice */ +static void miscdev_test_invalid_input(struct kunit *test) +{ + struct miscdevice misc_test =3D { + .minor =3D MISC_DYNAMIC_MINOR + 1, + .name =3D "misc_test", + .fops =3D &miscdev_test_fops, + }; + int ret; =20 - misc_deregister(&miscstat); + ret =3D misc_register(&misc_test); + KUNIT_EXPECT_EQ(test, ret, -EINVAL); + if (ret =3D=3D 0) + misc_deregister(&misc_test); } =20 static struct kunit_case test_cases[] =3D { - KUNIT_CASE(kunit_dynamic_minor), KUNIT_CASE(kunit_static_minor), KUNIT_CASE(kunit_misc_dynamic_minor), + KUNIT_CASE(miscdev_test_invalid_input), KUNIT_CASE_PARAM(miscdev_test_twice, miscdev_gen_params), KUNIT_CASE_PARAM(miscdev_test_duplicate_minor, miscdev_gen_params), KUNIT_CASE(miscdev_test_duplicate_name), --=20 2.34.1