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[73.183.53.213]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9397fb9bac1sm1194093685a.35.2026.09.08.10.47.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Sep 2026 10:47:46 -0700 (PDT) From: Brian Masney Date: Tue, 08 Sep 2026 13:47:18 -0400 Subject: [PATCH 1/4] driver: core: add subsys_driver() macro 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: 7bit Message-Id: <20260908-subsys_initcall-v1-1-cbccf4cd4288@redhat.com> References: <20260908-subsys_initcall-v1-0-cbccf4cd4288@redhat.com> In-Reply-To: <20260908-subsys_initcall-v1-0-cbccf4cd4288@redhat.com> To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Bjorn Andersson , Stephen Boyd , Jerome Brunet , Geert Uytterhoeven Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Brian Masney X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2040; i=bmasney@redhat.com; s=20250903; h=from:subject:message-id; bh=a7E1cAnanYVVkRWaKkPGdq4ia4gYC62syLjr8jr85LY=; b=owGbwMvMwCW2/dJd9di6A+2Mp9WSGLIWeNn2tBU1Ni1/dSggNbqg+dfChvjbuQt/uU6Q59qeu buBSUCwo5SFQYyLQVZMkWVJrlFBROoq23t3NFlg5rAygQxh4OIUgIlUcTMynEjas5VdRKHyXNSp jwynb6XoznuXmfJN85R/9wbxuKPTTjAyzIwrYIzpUotZnHuvkkEkgW9DRFtASu7/n+a/65dJC07 nBQA= X-Developer-Key: i=bmasney@redhat.com; a=openpgp; fpr=A46D32705865AA3DDEDC2904B7D2DD275D7EC087 Add a new macro subsys_driver() to eliminate some boilerplate code in drivers that need to register earlier in the boot at the subsys_initcall level. Signed-off-by: Brian Masney Assisted-by: Claude:claude-opus-4-8 --- include/linux/device/driver.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h index 768a1334c0a1..29fbc01ef06f 100644 --- a/include/linux/device/driver.h +++ b/include/linux/device/driver.h @@ -297,4 +297,35 @@ static int __init __driver##_init(void) \ } \ device_initcall(__driver##_init); +/** + * subsys_driver() - Helper macro for drivers that don't do anything special + * in init/exit but have to register earlier, at subsys_initcall level, when + * built in. This eliminates a lot of boilerplate. Each driver may only use + * this macro once, and calling it replaces the init/exit boilerplate. + * + * @__driver: driver name + * @__register: register function for this driver type + * @__unregister: unregister function for this driver type + * @...: Additional arguments to be passed to __register and __unregister. + * + * This is meant to be a direct parallel of module_driver() above, but with + * the init call promoted to subsys_initcall() for built-in drivers so they + * are available earlier during boot. When built as a module subsys_initcall() + * collapses to module_init() and the normal module init/exit paths are used. + * + * Use this macro to construct bus specific macros for registering drivers, + * and do not use it on its own. + */ +#define subsys_driver(__driver, __register, __unregister, ...) \ +static int __init __driver##_init(void) \ +{ \ + return __register(&(__driver), ##__VA_ARGS__); \ +} \ +subsys_initcall(__driver##_init) \ +static void __exit __driver##_exit(void) \ +{ \ + __unregister(&(__driver), ##__VA_ARGS__); \ +} \ +module_exit(__driver##_exit) + #endif /* _DEVICE_DRIVER_H_ */ -- 2.55.0