Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [PATCH] clocksource/drivers/arm_arch_timer: Initialize evtstrm after finalizing cpucaps | Date | Fri, 15 Sep 2023 21:14:25 +0200 |
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On Thu, Sep 07 2023 at 14:34, Mark Rutland wrote:
> We attempt to initialize each CPU's arch_timer event stream in > arch_timer_evtstrm_enable(), which we call from the > arch_timer_starting_cpu() cpu hotplug callback which is registered early > in boot. As this is registered before we initialize the system cpucaps, > the test for ARM64_HAS_ECV will always be false for CPUs present at boot > time, and will only be taken into account for CPUs onlined late > (including those which are hotplugged out and in again). > > Due to this, CPUs present and boot time may not use the intended divider > and scale factor to generate the event stream, and may differ from other > CPUs. > > Correct this by only initializing the event stream after cpucaps have been > finalized, registering a separate CPU hotplug callback for the event stream > configuration. Since the caps must be finalized by this point, use > spus_have_final_cap() to verify this. > > Signed-off-by: Mark Rutland <mark.rutland@arm.com> > Cc: Daniel Lezcano <daniel.lezcano@linaro.org> > Cc: Marc Zyngier <maz@kernel.org> > Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
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