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Date:	Mon, 27 Jan 2014 01:08:17 -0500
From:	Nicolas Pitre <>
To:	Russell King <>,
	Catalin Marinas <>,
	Benjamin Herrenschmidt <>,
	Paul Mundt <>,
	Thomas Gleixner <>,
	Ingo Molnar <>,
	Peter Zijlstra <>,
	"Rafael J. Wysocki" <>,
	Daniel Lezcano <>
Subject: [PATCH 2/9] ARM64: get rid of arch_cpu_idle_prepare()

ARM and ARM64 are the only two architectures implementing
arch_cpu_idle_prepare() simply to call local_fiq_enable().

We have secondary_start_kernel() already calling local_fiq_enable() and
this is done a second time in arch_cpu_idle_prepare() in that case. And
enabling FIQs has nothing to do with idling the CPU to start with.

So let's introduce init_fiq_boot_cpu() to take care of FIQs on the boot
CPU and remove arch_cpu_idle_prepare(). This is now done a bit earlier
at late_initcall time but this shouldn't make a difference in practice
given that FIQs are not currently used on ARM64.

Signed-off-by: Nicolas Pitre <>
 arch/arm64/kernel/process.c | 5 -----
 arch/arm64/kernel/setup.c   | 7 +++++++
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index de17c89985..f6c733da67 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -84,11 +84,6 @@ EXPORT_SYMBOL_GPL(pm_power_off);
 void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
-void arch_cpu_idle_prepare(void)
-	local_fiq_enable();
  * This is our default idle handler.
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index bd9bbd0e44..259557983a 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -255,6 +255,13 @@ static int __init arm64_device_init(void)
+static int __init init_fiq_boot_cpu(void)
+	local_fiq_enable();
+	return 0;
 static DEFINE_PER_CPU(struct cpu, cpu_data);
 static int __init topology_init(void)

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