mirror of
https://github.com/torvalds/linux
synced 2024-09-20 11:07:02 +00:00
89b3098703
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
46 lines
893 B
C
46 lines
893 B
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Low-level idle sequences
|
|
*/
|
|
|
|
#include <linux/cpu.h>
|
|
#include <linux/irqflags.h>
|
|
|
|
#include <asm/barrier.h>
|
|
#include <asm/cpuidle.h>
|
|
#include <asm/cpufeature.h>
|
|
#include <asm/sysreg.h>
|
|
|
|
/*
|
|
* cpu_do_idle()
|
|
*
|
|
* Idle the processor (wait for interrupt).
|
|
*
|
|
* If the CPU supports priority masking we must do additional work to
|
|
* ensure that interrupts are not masked at the PMR (because the core will
|
|
* not wake up if we block the wake up signal in the interrupt controller).
|
|
*/
|
|
void noinstr cpu_do_idle(void)
|
|
{
|
|
struct arm_cpuidle_irq_context context;
|
|
|
|
arm_cpuidle_save_irq_context(&context);
|
|
|
|
dsb(sy);
|
|
wfi();
|
|
|
|
arm_cpuidle_restore_irq_context(&context);
|
|
}
|
|
|
|
/*
|
|
* This is our default idle handler.
|
|
*/
|
|
void noinstr arch_cpu_idle(void)
|
|
{
|
|
/*
|
|
* This should do all the clock switching and wait for interrupt
|
|
* tricks
|
|
*/
|
|
cpu_do_idle();
|
|
}
|