linux/arch/loongarch/kernel/idle.c
Peter Zijlstra 89b3098703 arch/idle: Change arch_cpu_idle() behavior: always exit with IRQs disabled
Current arch_cpu_idle() is called with IRQs disabled, but will return
with IRQs enabled.

However, the very first thing the generic code does after calling
arch_cpu_idle() is raw_local_irq_disable(). This means that
architectures that can idle with IRQs disabled end up doing a
pointless 'enable-disable' dance.

Therefore, push this IRQ disabling into the idle function, meaning
that those architectures can avoid the pointless IRQ state flipping.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Acked-by: Mark Rutland <mark.rutland@arm.com> [arm64]
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Guo Ren <guoren@kernel.org>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195540.618076436@infradead.org
2023-01-13 11:48:15 +01:00

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C

// SPDX-License-Identifier: GPL-2.0
/*
* LoongArch idle loop support.
*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/cpu.h>
#include <linux/irqflags.h>
#include <asm/cpu.h>
#include <asm/idle.h>
void __cpuidle arch_cpu_idle(void)
{
raw_local_irq_enable();
__arch_cpu_idle(); /* idle instruction needs irq enabled */
raw_local_irq_disable();
}