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patch:
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GET /api/1.2/patches/2232223/?format=api
{ "id": 2232223, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2232223/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/patch/20260504003421.2545713-2-mikhail.kshevetskiy@iopsys.eu/", "project": { "id": 18, "url": "http://patchwork.ozlabs.org/api/1.2/projects/18/?format=api", "name": "U-Boot", "link_name": "uboot", "list_id": "u-boot.lists.denx.de", "list_email": "u-boot@lists.denx.de", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260504003421.2545713-2-mikhail.kshevetskiy@iopsys.eu>", "list_archive_url": null, "date": "2026-05-04T00:34:13", "name": "[v3,1/9] bitfield: Add non-constant field_{prep,get}() helpers", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a1e989165da3e9daa0a6ccca6c7930c0ac8da678", "submitter": { "id": 84987, "url": "http://patchwork.ozlabs.org/api/1.2/people/84987/?format=api", "name": "Mikhail Kshevetskiy", "email": "mikhail.kshevetskiy@iopsys.eu" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/uboot/patch/20260504003421.2545713-2-mikhail.kshevetskiy@iopsys.eu/mbox/", "series": [ { "id": 502598, "url": "http://patchwork.ozlabs.org/api/1.2/series/502598/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/list/?series=502598", "date": "2026-05-04T00:34:12", "name": "pinctrl: add support of Airoha SoCs", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/502598/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2232223/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2232223/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<u-boot-bounces@lists.denx.de>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=iopsys.eu header.i=@iopsys.eu header.a=rsa-sha256\n header.s=selector1 header.b=JDF0cXX2;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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Mon, 4 May 2026\n 00:34:39 +0000" ], "X-Spam-Checker-Version": "SpamAssassin 3.4.2 (2018-09-13) on phobos.denx.de", "X-Spam-Level": "", "X-Spam-Status": "No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,\n DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,\n RCVD_IN_DNSWL_BLOCKED,SPF_HELO_PASS,SPF_PASS autolearn=no\n autolearn_force=no version=3.4.2", "ARC-Seal": "i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none;\n b=P+iGPN6yCDvIdLGTtscYWJ9fpQ7ogGv8usfIS/B/7Z2Gq5nYBc+WFSJBI7QvNxUCxLDcoslzikaGyVhOaWPePDMzOm7MNMPeKvO92Txu+9cz5T5D/yEmQBf2J8BMB4HkgzSYdIzvsITSRz0MQgouT0NfZHVVZiZmo+7u3zigQh8JQIHQw4KRtP2ogeZ1Eld+GcfoQzl6rfoHtrXKPjCMV1M8rCkU/iQRBU1HTy/OdruMCX2iJ8ZJtPBnOih36XO35XODt+ZH4DYGCoNmqf5toX0ARn9W7K8ojGoAcBjvwAnrT3TWd2Ahr1CdCXBHgsG8j4J6GXv5Xhu+GZRce4azgA==", "ARC-Message-Signature": "i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;\n s=arcselector10001;\n 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;\n bh=agd54caNBhEzMkHLlKcQasaa/ynLBZ08mPHCb0+u9v0=;\n b=RxGFzK9Iy1eyuU5T1eBMz+LQHm1llRMKHUZOyt2BTfyjwkMdJzMpTSpWR0axBUm2OaU3+rxv/lj8K5D5zw2BfSUCBY6/244vCynHrzT+Syt+Fe12+GVWB36xk6LLJPSUlQ0GMArBlg9n4s96SQKqx6to6zl/Bl+VFib6rcfsScnPHuOkjMk+qXHygJmLpfmxcXkiscdbBiTDWuUWETacT7BbocON1iN76c50SxTn7fgeYNe7XrgKi0FRNGag9vyvtXyT18colckycDRfm7JYdmkD5GKmoVSrxb1Pu+fz/DLMkyumEL/N+K6AjgNFDFon33C3QrRIeJ1xgEzCYlRpKQ==", "ARC-Authentication-Results": "i=1; mx.microsoft.com 1; spf=pass\n smtp.mailfrom=genexis.eu; dmarc=pass action=none header.from=iopsys.eu;\n dkim=pass header.d=iopsys.eu; arc=none", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=iopsys.eu;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=agd54caNBhEzMkHLlKcQasaa/ynLBZ08mPHCb0+u9v0=;\n b=JDF0cXX2rbAH9nPS9OK4m8bLB10I+qa1nCKZB+L40smJkLOAzqg0CChk4QwGKQFOcW+G6fOa+GqQwzWNtSB7Cg+Zh/MIQxc3UdMDfPEN3qccawiINrG3Q2KXQYbYpfYdJ7RFTgNMiHCQUYMzxPEkrtkX0mtwC8os3NanxvavX31GqCYu/PmdewS9sKgQw2U18v8gbMCcSmqzrg13rkmbScZf3HJAD9sC4aaCtDE6OtIiNyoGL/o983QRN+XZEMA4h89QpqlD4qNnQ6+7qfyuV87WqIaaIBRy4y/o5JkPK54ykIdblm+4qdXGi6gD91L5D6qRMA/CU+7s+g6wyJ9X5A==", "From": "Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>", "To": "Tom Rini <trini@konsulko.com>, Christian Marangi <ansuelsmth@gmail.com>,\n Simon Glass <sjg@chromium.org>,\n Marek Vasut <marek.vasut+renesas@mailbox.org>, Peng Fan <peng.fan@nxp.com>,\n Michael Trimarchi <michael@amarulasolutions.com>,\n Anis Chali <chalianis1@gmail.com>, Michal Simek <michal.simek@amd.com>,\n Dan Carpenter <dan.carpenter@linaro.org>,\n Sean Anderson <sean.anderson@linux.dev>, Yao Zi <me@ziyao.cc>,\n \"Yury Norov (NVIDIA)\" <yury.norov@gmail.com>,\n Geert Uytterhoeven <geert+renesas@glider.be>,\n Alexandre Belloni <alexandre.belloni@bootlin.com>,\n Crt Mori <cmo@melexis.com>, Richard Genoud <richard.genoud@bootlin.com>,\n u-boot@lists.denx.de, David Lechner <dlechner@baylibre.com>,\n Lorenzo Bianconi <lorenzo@kernel.org>,\n Markus Gothe <markus.gothe@genexis.eu>,\n Matheus Sampaio Queiroga <srherobrine20@gmail.com>,\n Benjamin Larsson <benjamin.larsson@genexis.eu>", "Cc": "Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>,\n Jonathan Cameron <Jonathan.Cameron@huawei.com>,\n =?utf-8?q?Nuno_S=C3=A1?= <nuno.sa@analog.com>,\n Andy Shevchenko <andriy.shevchenko@intel.com>", "Subject": "[PATCH v3 1/9] bitfield: Add non-constant field_{prep,get}() helpers", "Date": "Mon, 4 May 2026 03:34:13 +0300", "Message-ID": "<20260504003421.2545713-2-mikhail.kshevetskiy@iopsys.eu>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260504003421.2545713-1-mikhail.kshevetskiy@iopsys.eu>", "References": "<20260504003421.2545713-1-mikhail.kshevetskiy@iopsys.eu>", "Content-Type": "text/plain; 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However, it is very common to prepare or extract bitfield\nelements where the bitfield mask is not a compile-time constant.\n\nTo avoid this limitation, the AT91 clock driver and several other\ndrivers already have their own non-const field_{prep,get}() macros.\nMake them available for general use by adding them to\n<linux/bitfield.h>, and improve them slightly:\n 1. Avoid evaluating macro parameters more than once,\n 2. Replace \"ffs() - 1\" by \"__ffs()\",\n 3. Support 64-bit use on 32-bit architectures,\n 4. Wire field_{get,prep}() to FIELD_{GET,PREP}() when mask is\n actually constant.\n\nThis is deliberately not merged into the existing FIELD_{GET,PREP}()\nmacros, as people expressed the desire to keep stricter variants for\nincreased safety, or for performance critical paths.\n\nYury: use __mask within new macros.\n\nSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>\nAcked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>\nAcked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>\nAcked-by: Crt Mori <cmo@melexis.com>\nAcked-by: Nuno Sá <nuno.sa@analog.com>\nAcked-by: Richard Genoud <richard.genoud@bootlin.com>\nReviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>\nReviewed-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>\nSigned-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>\n---\n include/linux/bitfield.h | 59 ++++++++++++++++++++++++++++++++++++++++\n 1 file changed, 59 insertions(+)", "diff": "diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h\nindex 63928f17322..efad7227bdc 100644\n--- a/include/linux/bitfield.h\n+++ b/include/linux/bitfield.h\n@@ -16,6 +16,7 @@\n * FIELD_{GET,PREP} macros take as first parameter shifted mask\n * from which they extract the base mask and shift amount.\n * Mask must be a compilation time constant.\n+ * field_{get,prep} are variants that take a non-const mask.\n *\n * Example:\n *\n@@ -203,4 +204,62 @@ __MAKE_OP(64)\n #undef __MAKE_OP\n #undef ____MAKE_OP\n \n+#define __field_prep(mask, val)\t\t\t\t\t\t\\\n+\t({\t\t\t\t\t\t\t\t\\\n+\t\t__auto_type __mask = (mask);\t\t\t\t\\\n+\t\ttypeof(__mask) __val = (val);\t\t\t\t\\\n+\t\tunsigned int __shift = BITS_PER_TYPE(__mask) <= 32 ?\t\\\n+\t\t\t\t __ffs(__mask) : __ffs64(__mask);\t\\\n+\t\t(__val << __shift) & __mask;\t\t\t\t\\\n+\t})\n+\n+#define __field_get(mask, reg)\t\t\t\t\t\t\\\n+\t({\t\t\t\t\t\t\t\t\\\n+\t\t__auto_type __mask = (mask);\t\t\t\t\\\n+\t\ttypeof(__mask) __reg = (reg);\t\t\t\t\\\n+\t\tunsigned int __shift = BITS_PER_TYPE(__mask) <= 32 ?\t\\\n+\t\t\t\t __ffs(__mask) : __ffs64(__mask);\t\\\n+\t\t(__reg & __mask) >> __shift;\t\t\t\t\\\n+\t})\n+\n+/**\n+ * field_prep() - prepare a bitfield element\n+ * @mask: shifted mask defining the field's length and position, must be\n+ * non-zero\n+ * @val: value to put in the field\n+ *\n+ * Return: field value masked and shifted to its final destination\n+ *\n+ * field_prep() masks and shifts up the value. The result should be\n+ * combined with other fields of the bitfield using logical OR.\n+ * Unlike FIELD_PREP(), @mask is not limited to a compile-time constant.\n+ * Typical usage patterns are a value stored in a table, or calculated by\n+ * shifting a constant by a variable number of bits.\n+ * If you want to ensure that @mask is a compile-time constant, please use\n+ * FIELD_PREP() directly instead.\n+ */\n+#define field_prep(mask, val)\t\t\t\t\t\t\\\n+\t(__builtin_constant_p(mask) ? __FIELD_PREP(mask, val, \"field_prep: \") \\\n+\t\t\t\t : __field_prep(mask, val))\n+\n+/**\n+ * field_get() - extract a bitfield element\n+ * @mask: shifted mask defining the field's length and position, must be\n+ * non-zero\n+ * @reg: value of entire bitfield\n+ *\n+ * Return: extracted field value\n+ *\n+ * field_get() extracts the field specified by @mask from the\n+ * bitfield passed in as @reg by masking and shifting it down.\n+ * Unlike FIELD_GET(), @mask is not limited to a compile-time constant.\n+ * Typical usage patterns are a value stored in a table, or calculated by\n+ * shifting a constant by a variable number of bits.\n+ * If you want to ensure that @mask is a compile-time constant, please use\n+ * FIELD_GET() directly instead.\n+ */\n+#define field_get(mask, reg)\t\t\t\t\t\t\\\n+\t(__builtin_constant_p(mask) ? __FIELD_GET(mask, reg, \"field_get: \") \\\n+\t\t\t\t : __field_get(mask, reg))\n+\n #endif\n", "prefixes": [ "v3", "1/9" ] }