Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH v1 2/5] cpufreq: intel_pstate: Simplify spinlock locking | Date | Thu, 21 Mar 2024 20:30:42 +0100 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Because intel_pstate_enable/disable_hwp_interrupt() are only called from thread context, they need not save the IRQ flags when using a spinlock as interrupts are guaranteed to be enabled when they run, so make them use spin_lock/unlock_irq().
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- drivers/cpufreq/intel_pstate.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)
Index: linux-pm/drivers/cpufreq/intel_pstate.c =================================================================== --- linux-pm.orig/drivers/cpufreq/intel_pstate.c +++ linux-pm/drivers/cpufreq/intel_pstate.c @@ -1682,30 +1682,26 @@ ack_intr: static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata) { - unsigned long flags; - if (!boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) return; /* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */ wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); - spin_lock_irqsave(&hwp_notify_lock, flags); + spin_lock_irq(&hwp_notify_lock); if (cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask)) cancel_delayed_work(&cpudata->hwp_notify_work); - spin_unlock_irqrestore(&hwp_notify_lock, flags); + spin_unlock_irq(&hwp_notify_lock); } static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata) { /* Enable HWP notification interrupt for guaranteed performance change */ if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) { - unsigned long flags; - - spin_lock_irqsave(&hwp_notify_lock, flags); + spin_lock_irq(&hwp_notify_lock); INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work); cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask); - spin_unlock_irqrestore(&hwp_notify_lock, flags); + spin_unlock_irq(&hwp_notify_lock); /* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */ wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x01);
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