{"id":2232223,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2232223/?format=json","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=json","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=json","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=json","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":"","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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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, 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 \nAcked-by: Alexandre Belloni \nAcked-by: Jonathan Cameron \nAcked-by: Crt Mori \nAcked-by: Nuno Sá \nAcked-by: Richard Genoud \nReviewed-by: Andy Shevchenko \nReviewed-by: Yury Norov (NVIDIA) \nSigned-off-by: Yury Norov (NVIDIA) \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"]}