linux-kernel - [PATCH v1 1/5] intel_idle: Use subsys_initcall

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Message-ID: <2994397.e9J7NaK4W3@rjwysocki.net>
Date: Thu, 05 Jun 2025 17:04:11 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: x86 Maintainers <x86@...nel.org>, Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Linux ACPI <linux-acpi@...r.kernel.org>
Subject:
 [PATCH v1 1/5] intel_idle: Use subsys_initcall_sync() for initialization

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

It is not necessary to wait until the device_initcall() stage with
intel_idle initialization.  All of its dependencies are met after
all subsys_initcall()s have run, so subsys_initcall_sync() can be
used for initializing it.

It is also better to ensure that intel_idle will always initialize
before the ACPI processor driver that uses module_init() for its
initialization.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/idle/intel_idle.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -2517,7 +2517,7 @@
 	return retval;

 }
-device_initcall(intel_idle_init);
+subsys_initcall_sync(intel_idle_init);

 /*
  * We are not really modular, but we used to support that.  Meaning we also