From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from SJ2PR03CU001.outbound.protection.outlook.com (mail-westusazon11012010.outbound.protection.outlook.com [52.101.43.10]) (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 EE22248E0E7; Sat, 17 Oct 2026 15:02:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.43.10 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792249363; cv=fail; b=uKVeAPdff8QFIv/1hWVFMdU/BApSVyMu3EpnnZm1c5L5a0b8ZCf8R//16X0fO1rquP5qMtP7FIwGGd1xVrL88nX8xlbrAu/75DBxay16RalQLIjiC564nA8MXJUNQ7ut6T53fB1G8u9Xyf79WM3XICSgju51z4Wh7NIfGqASI2w= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792249363; c=relaxed/simple; bh=3fjbTfDEKc2X3flF3hquABb+OfIN4lR1DpTMLJUZghk=; h=From:To:CC:Subject:Date:Message-ID:References:In-Reply-To: Content-Type:MIME-Version; b=vEDa1B4sS37LE819JhmkaR2ygWZw7HiiOdf2ZfzDAaKLYjM7VmgBXqmVMljCYwWhSnA454RDfwqNAi+O6kt+xacVWU2xpJ5VE7Cr2Ea8/GpUsnfDGtQ3a7e0LteAdSxNcrWpdhEHbkOntVmZ/AqLdjKRz6lkLurSu7ambZGZgQ0= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=tIc6cgH+; arc=fail smtp.client-ip=52.101.43.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="tIc6cgH+" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=MpkjEI3rz4q0l6hLIQCLC6kzGr+W+ZivO8zVkoh/HjwSJ53WYp4mylS3kCmhQniiQr7AK1Ck1yC4cLFv47+yNxWRQIZEFGkdD569+ZtWPYHMzpMxvhqP0LZP5vy0wM9V8BYylYKMQoWz6K4VFjhhB/+GLIzhILaGDh6ze6nOe+z0osZz0wRc88jKdy4NhrGTyhBliUrgbprN36Tf3Eo6JfLw8+9pMmCNLDVxipb9NoPkvbklzF30+MHDC96blwFWrJ2ts1wjzJynmmG2lN3XMcq/DQP56iStCAs7RH59lpqu9Cdr2jedcKfZF+YIqZ0hQoTQ9OmmRF7zDZzZ4O2CVQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=3fjbTfDEKc2X3flF3hquABb+OfIN4lR1DpTMLJUZghk=; b=ITkRfpAqGxZ33Ct6HRw45akuMUxFBmThicSOzsYgzwaeAv68aXqTSqg9AFb4SHnTDRVnIBCLTfT2IOEtMkd/+0uM84svdUfvbH/y8IOSKz358/bQAIMISy1aZn/hlavWOyIVwV5kb6nkHCY7U8H1lAyX7ae1JjJeyyKwLulOqtnmdKRpyVYaU7HYSGqAe/LseEq1kdGzjU4hD5NQrnYaUgFzW6+5bMj+6iJFFJrDstU7siDqYef4lI+CBXJz2O6bWqDQU2J4HtBd0ssyfrP2lzbihwS81KX1b5RI+98FeekGA41kdt5uuEb5txgbZ0jPmNW2WR/gJ7GFVNJbKqTm4g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=3fjbTfDEKc2X3flF3hquABb+OfIN4lR1DpTMLJUZghk=; b=tIc6cgH+XzltES3TOmcBUCDK3J/tDKvYRwSkCjfFuisLbIPK6xtGH2VvLALYMR1scSzBGLiOkHp9TsyxZrULMNBRlPRVR1X+QtS+m2TQ+47c3RPEt0i2XSqigmdwYBUPWc4s2RsJzpuEE0F9YQLw7Me40ZTmK8NC4BW7I3Zbea61LWvF9cgGc7RHjtKLYfZpcYNQ4Jf3wkREtrDNOS73MJ64zku5CbW6tKBjKO88Rs0bW+u1djrbIb0o2ESfUn3AJNbwKIxqAXpbVl3B4PMji8ReGOn0dblg/1cCtQLKwRkcDJt2LwB5cUknISTk2Enhl5jDP0F5ixjDwHCzErBuRQ== Received: from DS0PR12MB6486.namprd12.prod.outlook.com (2603:10b6:8:c5::21) by DM6PR12MB4298.namprd12.prod.outlook.com (2603:10b6:5:21e::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.522.12; Sat, 17 Oct 2026 15:02:38 +0000 Received: from DS0PR12MB6486.namprd12.prod.outlook.com ([fe80::88a9:f314:c95f:8b33]) by DS0PR12MB6486.namprd12.prod.outlook.com ([fe80::88a9:f314:c95f:8b33%6]) with mapi id 15.21.0496.021; Sat, 17 Oct 2026 15:02:37 +0000 From: Joel Fernandes To: Zqiang CC: "paulmck@kernel.org" , "frederic@kernel.org" , "neeraj.upadhyay@kernel.org" , "urezki@gmail.com" , "boqun@kernel.org" , "rcu@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "qiang.zhang@linux.dev" Subject: Re: [PATCH] rcu-tasks: Warn on too-short RCU Tasks Rude grace period Thread-Topic: [PATCH] rcu-tasks: Warn on too-short RCU Tasks Rude grace period Thread-Index: AQHdXIoOw8oKAMF5GkqWWPIoLDAGl7cB2AQs Date: Sat, 17 Oct 2026 15:02:37 +0000 Message-ID: <970F52C9-3198-4BD1-B1A9-6A4B24F550AA@nvidia.com> References: <20261015094619.8773-1-qiang.zhang@linux.dev> In-Reply-To: <20261015094619.8773-1-qiang.zhang@linux.dev> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: mx.microsoft.com 1; dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: DS0PR12MB6486:EE_|DM6PR12MB4298:EE_ x-ms-office365-filtering-correlation-id: 0fe5dad0-6233-4c67-5eee-08df2c5faeca x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|23010399003|10070799003|1800799024|366016|376014|56012099006|38070700021|11063799006|18002099003|22082099003|10067099003; x-microsoft-antispam-message-info: 6i+qUGKaxDZhDoaVsV6zwoDRdWCgR+Z+qgBKca6b2h70JLgsbJ35+c0qELjFC+WTRfiCEE1X0NqJtpqNAzRV1S6gpqU11dYqXTlGzgea3A+WvXeE9aCUYmeWecQM4jpI0nryuRq29B01+MaoZRrBDZcVBVTWwPaXU1eyRiGmwZiRP22rJNDzCje+0Tlcfidd05Eg+dTEpFhTcGL0t4FO/SSfoGf1Fg/MxsHPOOHNYxuGotmdMBMwys3w0CpVukT0j/gnfzQ7KAEwrsF5PVxBEXLG2UNMIh9JQkS/05kESmV3QYRQJgPbCp4xi0+usIOJMwHXKU82+bgxTjIPQdfh1TQKqh02JD6KxYJx3YaJvebO250+BITFoOYNeI/6oYUagug6T5EfSPDyAjO5HCdi5gSv0Jc26w1PHQgkgTC2eQ2g3Jg3U6sxAdunUrnk9W2YUdDzCda6kiQqzUeN9CHc8JYNuBMKw9eyXogIEQN8D4WQbx8NMmMAikKhyOW0El+gHUoUPq8W4VguXF39qMYBij5CXd4oOgi+BLA0K67GPps94lYNGIF1uBYOBAIiHS2FfwojBnVYHlx+Exg42lGMpf4AxC+JJvmHfmLhqjM9+O8xr1iwq0UOmfA4CIYTuT99KNvNbp5NWqyxW0veV+8OFw63QYaK1ogjXx4iH/Zucm9ZzyehfqoNPbH1pZ9yZ4KAs7SSljflEyy33KDyTs9IGTxNN6XuqnKN9T72SVqYAfU= x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS0PR12MB6486.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(23010399003)(10070799003)(1800799024)(366016)(376014)(56012099006)(38070700021)(11063799006)(18002099003)(22082099003)(10067099003);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 2 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?MWgyUGp3QnBKQ0ZKelJTZ1FkOGYwRThpR1EzUmVRZm8zUHJRL1ZJaHpjNVZj?= =?utf-8?B?Z0gzVERLMStORDU2MzIyT25zQ1lZLzRENUp2VnVRaUhrOTdGWVNtWE9lZjdY?= =?utf-8?B?NkZseU1SdCs0NTB2VTRlOHlzTDNvU2V6T1lmWnJ0R1IzcE1XbktsVTB5ZFcy?= =?utf-8?B?dGNNeWVUYmxrNmVmRjVzTzhWSHovOStobG1NdXpaaStzTEJzM0xaS2pRRUI4?= =?utf-8?B?SE1WYjNQTDBuOHlPZHNsWnNnZ3pwV2lNN3M3RCtvbENMU2FpSGRaRWpMYkdq?= =?utf-8?B?bElNbDdQcXlaVjRGZTlQN2pQK2JWYmVieFdaM0hjT0ZFWUNlTVlIeHV1dTl3?= =?utf-8?B?bEcwS2hOaUxSTTJpVElpVk56b3NaZ3V5aGFSWjNRa2VTOFE3VTQyVUtIT1Aw?= =?utf-8?B?VGo4czFFODlGZy9NMjkwY0ZhNTJzRFVMbEI3TG5hK3pZTTJjaHhBczE1TUps?= =?utf-8?B?dWUvR3RwTEVVTk1ZQ043TDEwdFhtQ2wxekNQdFJFQldZVmtyQ2NZdDJvQk9v?= =?utf-8?B?SVd3ZU1GYytsVTlHSUFWNU4vTlJCTHJlZFpaZnhrMDREZXBZWFZxVlkrcERP?= =?utf-8?B?UHpNcEkydncrMEZEUVF5M3luWHJ6ZUZSZFZTc2k1Tk84RlVsVE5RRTBtMXNQ?= =?utf-8?B?WFpuNmh4Ulc4ekFWL1MvenhmWkVuOVJzL2R4Q3FZWUdVcldFUGdhOEhqSkNv?= =?utf-8?B?OUtoU0dXUTdzTmpDZGF3OE1jVm9UYTdQa0ZsS1dIUXVTZGkrRHZpb0dzMzUy?= =?utf-8?B?L0VwTXF6N3kyMERFVDBLeTRKNGduMHBrNkJiZ0lyV295OFlDQWtwM1cvNi9v?= =?utf-8?B?TkVsU3lsYXNwMVh3d1M0UGhUVkZtRzRVOW9qVW1KMGlmMG1nQTFYd0ZOZ0NS?= =?utf-8?B?ZFlKOGhScFFva0JCbW90UlB3Rzg5Y1BEb2lCbnllbmdROW9EZ2NndU1OK1Ji?= =?utf-8?B?bUpRdTZCbXZVOHRTdXY5b0dxbmY3N0w2L0UvR2VGSlRGS1ZsdE40WDNXVERm?= =?utf-8?B?ZS9zK3Y1Z0V4emo5ajR6dEYrY1RRME1Xa1pabWl0d1h2RDdWZ1NOUjdsWTVv?= =?utf-8?B?b0VEYTJMMlRoMFZpZS9CUlNyVXN3c09Wb083MkQ4QTBBUGlBM2Z5UHAwblpn?= =?utf-8?B?K3RJQjJOY2ZiamN1ZjNBSzUvMVliNWN2N015Y3ZuUnQrU25sNmJKSXFYVEFE?= =?utf-8?B?bWl1WEJHY1dYY2QwN3NxaFQwaGgvemJvNWdEMXk3a2VFZHlqNTZaclN6Ujcz?= =?utf-8?B?ZWpkNjNacHl0Q2JabVl5Rk5NeS9ZZ1k5ZlZEbDVLL1FXd3daK3dobGM1QXZM?= =?utf-8?B?Q0RWcnJ3dTBHTEtQZndGcU56bXpYWWF4dXUyL3M0VjVxUThyMi9VWXZuWFg0?= =?utf-8?B?VDlYZklidnhXQnFreWRpbFBGR2ZMc0llUHJPbnViVGVabFJqME01bUt1Q1N5?= =?utf-8?B?dURvV3FUTkVkREVhK1EwWFZrNUJkbmFzNlZYUHRiczlkSFM5V2xEMnNaeUlO?= =?utf-8?B?M2VKWldpVUJ2RFBlSGdnTEc1RzB6TnBiVTJoLzA3cWNucDY3ZHhTM2tCTmFC?= =?utf-8?B?WGc0M1ZQTGYyWFNiZ0NxSnhrc3NnVDJFbDdVZ3Z4MFhLYU01Vmd0RVlXeEhl?= =?utf-8?B?REh4Y0ZDYjU5dUlxZXhaQjFSOEhJV2xoeHB3dnVLUDlla0kxZnBRSDEzMWUz?= =?utf-8?B?SGpZRW1XUWR0bzFHbHE4TEpqVGQrbXhzaVRDSy8wMnk3Q08xZHBhUWxhVjRz?= =?utf-8?B?bEZtV2ZHdlpWdEs5NzVXSGRXZThuYTRYOHZCVnZiM1hpRHZlenJuUWJHdnoy?= =?utf-8?B?OS9mTDliMk8wOEVUeDFsUDRENzloZEZlSUJRVlVJcWtkRGVwOEorUS9Qbjlm?= =?utf-8?B?eFZrN29OZjF3ZEVLdzJrZTN6Ri9vYldZMXhIVU1QKy82TU5GcnUrclRZRVN6?= =?utf-8?B?UGU4V3ZkK1Jmekl5L09QbzhVY0ZhWnk4VGxNUDNIK213aC90MklhUTNIL0J2?= =?utf-8?B?MGtEN3pEdUMrRFQvcUZSdVVwYkVITUJtL3k0RnBaak5iR3RVSkNpNUR0ME02?= =?utf-8?B?VTZ5aUdubUhXS2RCS2RnREtqWDJjZVFhSTJxaVNQaFFyajJKZGNrL21JWFZT?= =?utf-8?B?am5zY0x5REZ3Q0NQOFJJVmlhaHVJVThaYnV5WXBpa1pkQ3c2aDlXeE1WYTNE?= =?utf-8?B?Sm5qL2RvQUcxN0NIczFWQkFtbldGUlpFdzloQ05xLzBOa1B3WVhUSkxMTEdJ?= =?utf-8?B?blBPK2FsK0RPMDZscFBURkthcmZ3azg4TEd3Skw2Q2ExK014blVyS2RxOTFP?= =?utf-8?B?K3FJM2NHeFdXR2NXYnp4bnpscEtKM2hiVHptUG1semlYdDRXQ1dWb2VPMG9H?= =?utf-8?Q?hKQWJeYahdKQFTTi4gpfxNfpl1RGJKQN77yF6R7jAooXT?= x-ms-exchange-antispam-messagedata-1: lDzRD7BOAf60Zw== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DS0PR12MB6486.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0fe5dad0-6233-4c67-5eee-08df2c5faeca X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Oct 2026 15:02:37.5866 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: wHbgBwRTb6OCHIrEItv1S2Nk97BgvhJD2GgaBPFzO4ScV7q9JHzGWyWOH2noIcwOSWMV7uBQPzXOYV7jvPWyJA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4298 DQoNCj4gT24gT2N0IDE1LCAyMDI2LCBhdCA1OjQ24oCvQU0sIFpxaWFuZyA8cWlhbmcuemhhbmdA bGludXguZGV2PiB3cm90ZToNCj4gDQo+IO+7v1RoZSBSQ1UgVGFza3MgUnVkZSBncmFjZSBwZXJp b2QgaXMgaW1wbGVtZW50ZWQgYnkgaW52b2tpbmcgdGhlDQo+IHNjaGVkdWxlX29uX2VhY2hfY3B1 KCkgd2l0aCBhbiBlbXB0eSB3b3JrIGZ1bmN0aW9uLCB3aGljaCBmb3JjZXMNCj4gYSBjb250ZXh0 IHN3aXRjaCBvbiBldmVyeSBvbmxpbmUgQ1BVIGFuZCBndWFyYW50ZWVzIHRoYXQgYWxsDQo+IHJ1 ZGUtdGFza3MgcmVhZC1zaWRlIGNyaXRpY2FsIHNlY3Rpb25zIGhhdmUgY29tcGxldGVkLiBIb3dl dmVyLA0KPiBzY2hlZHVsZV9vbl9lYWNoX2NwdSgpIGNhbiBmYWlsICh2aWEgYWxsb2NfcGVyY3B1 KCkgcmV0dXJuaW5nDQo+IC1FTk9NRU0pIGFuZCByZXR1cm5zIGltbWVkaWF0ZWx5LCBpbiB3aGlj aCBjYXNlIHRob3NlIGNvbnRleHQNCj4gc3dpdGNoZXMgbmV2ZXIgaGFwcGVuLCB0b28tc2hvcnQg Z3JhY2UgcGVyaW9kIGhhcHBlbi4NCj4gDQo+IFRoaXMgY29tbWl0IHRoZXJlZm9yZSB3cmFwcyB0 aGUgc2NoZWR1bGVfb25fZWFjaF9jcHUoKSBjYWxsIGluDQo+IFdBUk5fT05DRSgpIHNvIHRoYXQg dGhpcyBmYWlsdXJlIGlzIHJlcG9ydGVkIGFzIGEgIlRvby1zaG9ydA0KPiBncmFjZSBwZXJpb2Qi IHdhcm5pbmcuDQo+IA0KPiBTaWduZWQtb2ZmLWJ5OiBacWlhbmcgPHFpYW5nLnpoYW5nQGxpbnV4 LmRldj4NCj4gLS0tDQo+IGtlcm5lbC9yY3UvdGFza3MuaCB8IDMgKystDQo+IDEgZmlsZSBjaGFu Z2VkLCAyIGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkNCj4gDQo+IGRpZmYgLS1naXQgYS9r ZXJuZWwvcmN1L3Rhc2tzLmggYi9rZXJuZWwvcmN1L3Rhc2tzLmgNCj4gaW5kZXggZmNhYzczNjFl YzUxLi45MWMyNTcxNzQwMmUgMTAwNjQ0DQo+IC0tLSBhL2tlcm5lbC9yY3UvdGFza3MuaA0KPiAr KysgYi9rZXJuZWwvcmN1L3Rhc2tzLmgNCj4gQEAgLTEzNjEsNyArMTM2MSw4IEBAIHN0YXRpYyB2 b2lkIHJjdV90YXNrc19iZV9ydWRlKHN0cnVjdCB3b3JrX3N0cnVjdCAqd29yaykNCj4gc3RhdGlj IHZvaWQgcmN1X3Rhc2tzX3J1ZGVfd2FpdF9ncChzdHJ1Y3QgcmN1X3Rhc2tzICpydHApDQo+IHsN Cj4gICAgcnRwLT5uX2lwaXMgKz0gY3B1bWFza193ZWlnaHQoY3B1X29ubGluZV9tYXNrKTsNCj4g LSAgICBzY2hlZHVsZV9vbl9lYWNoX2NwdShyY3VfdGFza3NfYmVfcnVkZSk7DQo+ICsgICAgV0FS Tl9PTkNFKHNjaGVkdWxlX29uX2VhY2hfY3B1KHJjdV90YXNrc19iZV9ydWRlKSwNCj4gKyAgICAg ICAgICAiJXM6IFRvby1zaG9ydCBncmFjZSBwZXJpb2QsIE9PTSBpcyBub3cgZXhwZWN0ZWQgYmVo YXZpb3IhISFcbiIsIHJ0cC0+bmFtZSk7DQoNCklzIHRoYXQgdGhlIGJlc3QgZXJyb3IgbWVzc2Fn ZT8gT09NIGlzIGV4cGVjdGVkIHdoZW4gZ3JhY2UgcGVyaW9kcyBkbyBub3QgY29uY2x1ZGUuDQoN ClRoYW5rcy4NCg0KPiB9DQo+IA0KPiBzdGF0aWMgdm9pZCBjYWxsX3JjdV90YXNrc19ydWRlKHN0 cnVjdCByY3VfaGVhZCAqcmhwLCByY3VfY2FsbGJhY2tfdCBmdW5jKTsNCj4gLS0NCj4gMi4xNy4x DQo+IA0K