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GET /api/1.2/patches/2224664/?format=api
{ "id": 2224664, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2224664/?format=api", "web_url": "http://patchwork.ozlabs.org/project/rtc-linux/patch/20260417173621.368914-2-ynorov@nvidia.com/", "project": { "id": 9, "url": "http://patchwork.ozlabs.org/api/1.2/projects/9/?format=api", "name": "Linux RTC development", "link_name": "rtc-linux", "list_id": "linux-rtc.vger.kernel.org", "list_email": "linux-rtc@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260417173621.368914-2-ynorov@nvidia.com>", "list_archive_url": null, "date": "2026-04-17T17:36:12", "name": "[1/9] bitfield: add FIELD_GET_SIGNED()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "21db05175a96381f5b0989c1fe62f4a88f7db29d", "submitter": { "id": 92516, "url": "http://patchwork.ozlabs.org/api/1.2/people/92516/?format=api", "name": "Yury Norov", "email": "ynorov@nvidia.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/rtc-linux/patch/20260417173621.368914-2-ynorov@nvidia.com/mbox/", "series": [ { "id": 500382, "url": "http://patchwork.ozlabs.org/api/1.2/series/500382/?format=api", "web_url": "http://patchwork.ozlabs.org/project/rtc-linux/list/?series=500382", "date": "2026-04-17T17:36:11", "name": "bitfield: add FIELD_GET_SIGNED()", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500382/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224664/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224664/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-rtc+bounces-6360-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-rtc@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=lqDUkyKe;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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dmarc=pass action=none header.from=nvidia.com;\n dkim=pass header.d=nvidia.com; arc=none" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com;\n s=selector2;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=ctnTpI2RNaqGdOP2b+kZbogh55OglPF3v2wXKLiOyIw=;\n b=lqDUkyKeIPYkbRGx8ItjIrAj4HDf4BxtycHsk8GY1cOpba2g9oSMKNClyPYkoX0DVIpwLm7T5CvdzHfyg2AAmeqiI+oZK1vC+dtcVRidVXW9WWhcq75f5kGJdq5f7wAlXPIKJzJ7k79RBO8GIeqg6cg5VrrUwMRFmo1GopnG+YWte9VHWpU0pXJn6LFFqyH9mPunLTeePLLGl6nLCDvpuZEcq3uqzwvcFDqMaEQn86QR4WPFb7SxN7PhDFdJCI5tXuvXqaNTNV9gUm/VZL0qYa6d711W4JARwPkDuimxki4Zmo9+LwQQ2cZ9BItOqXwIb02IExUJQ8xI5YHw8/V3Tg==", "From": "Yury Norov <ynorov@nvidia.com>", "To": "Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,\n Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>,\n x86@kernel.org, \"H. Peter Anvin\" <hpa@zytor.com>,\n Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>,\n Jonathan Cameron <jic23@kernel.org>, David Lechner <dlechner@baylibre.com>,\n\t=?utf-8?q?Nuno_S=C3=A1?= <nuno.sa@analog.com>,\n Andy Shevchenko <andy@kernel.org>, Ping-Ke Shih <pkshih@realtek.com>,\n Richard Cochran <richardcochran@gmail.com>,\n Andrew Lunn <andrew+netdev@lunn.ch>, \"David S. Miller\" <davem@davemloft.net>,\n Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>,\n Paolo Abeni <pabeni@redhat.com>,\n Alexandre Belloni <alexandre.belloni@bootlin.com>,\n Yury Norov <yury.norov@gmail.com>,\n Rasmus Villemoes <linux@rasmusvillemoes.dk>,\n Hans de Goede <hansg@kernel.org>, Linus Walleij <linusw@kernel.org>,\n Sakari Ailus <sakari.ailus@linux.intel.com>,\n Salah Triki <salah.triki@gmail.com>, Achim Gratz <Achim.Gratz@Stromeko.DE>,\n Ben Collins <bcollins@watter.com>, linux-kernel@vger.kernel.org,\n linux-iio@vger.kernel.org, linux-wireless@vger.kernel.org,\n netdev@vger.kernel.org, linux-rtc@vger.kernel.org", "Cc": "Yury Norov <ynorov@nvidia.com>", "Subject": "[PATCH 1/9] bitfield: add FIELD_GET_SIGNED()", "Date": "Fri, 17 Apr 2026 13:36:12 -0400", "Message-ID": "<20260417173621.368914-2-ynorov@nvidia.com>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260417173621.368914-1-ynorov@nvidia.com>", "References": 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"\n\tCIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CY8PR12MB8300.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(10070799003)(366016)(1800799024)(7416014)(376014)(921020)(56012099003)(18002099003)(22082099003);DIR:OUT;SFP:1101;", "X-MS-Exchange-AntiSpam-MessageData-ChunkCount": "1", "X-MS-Exchange-AntiSpam-MessageData-0": "\n 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", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 34b93e52-c9d7-4dff-c7f0-08de9ca7da02", "X-MS-Exchange-CrossTenant-AuthSource": "CY8PR12MB8300.namprd12.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "17 Apr 2026 17:36:26.5109\n (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": "\n Y1+iT6ksODVlWJSSwv2UJ8r/LIC1ctrCy44eDZQ8DrwfQdDJKcsOIaTMOcAWLeEP7lynyjB3bOrXPW4hjFA0CA==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "SA1PR12MB8744" }, "content": "The bitfields are designed in assumption that fields contain unsigned\ninteger values, thus extracting the values from the field implies\nzero-extending.\n\nSome drivers need to sign-extend their fields, and currently do it like:\n\n\tdc_re += sign_extend32(FIELD_GET(0xfff000, tmp), 11);\n\tdc_im += sign_extend32(FIELD_GET(0xfff, tmp), 11);\n\nIt's error-prone because it relies on user to provide the correct\nindex of the most significant bit and proper 32 vs 64 function flavor.\n\nThus, introduce a FIELD_GET_SIGNED() macro, which is the more\nconvenient and compiles (on x86_64) to just a couple instructions:\nshl and sar.\n\nSigned-off-by: Yury Norov <ynorov@nvidia.com>\n---\n include/linux/bitfield.h | 16 ++++++++++++++++\n 1 file changed, 16 insertions(+)", "diff": "diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h\nindex 54aeeef1f0ec..35ef63972810 100644\n--- a/include/linux/bitfield.h\n+++ b/include/linux/bitfield.h\n@@ -178,6 +178,22 @@\n \t\t__FIELD_GET(_mask, _reg, \"FIELD_GET: \");\t\t\\\n \t})\n \n+/**\n+ * FIELD_GET_SIGNED() - extract a signed bitfield element\n+ * @mask: shifted mask defining the field's length and position\n+ * @reg: value of entire bitfield\n+ *\n+ * Returns the sign-extended field specified by @_mask from the\n+ * bitfield passed in as @_reg by masking and shifting it down.\n+ */\n+#define FIELD_GET_SIGNED(mask, reg)\t\t\t\t\t\\\n+\t({\t\t\t\t\t\t\t\t\\\n+\t\t__BF_FIELD_CHECK(mask, reg, 0U, \"FIELD_GET_SIGNED: \");\t\\\n+\t\t ((__signed_scalar_typeof(mask))((long long)(reg) <<\t\\\n+\t\t __builtin_clzll(mask) >> (__builtin_clzll(mask) +\t\\\n+\t\t\t\t\t\t__builtin_ctzll(mask))));\\\n+\t})\n+\n /**\n * FIELD_MODIFY() - modify a bitfield element\n * @_mask: shifted mask defining the field's length and position\n", "prefixes": [ "1/9" ] }