[PATCH v4 01/38] clocksource/drivers/arm_arch_timer: Initialize evtstrm after finalizing cpucaps

[Daniel Lezcano]

On 16/10/2023 12:24, 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
> cpus_have_final_cap() to verify this.
> 
> Signed-off-by: Mark Rutland <mark.rutland at arm.com>
> Acked-by: Marc Zyngier <maz at kernel.org>
> Acked-by: Thomas Gleixner <tglx at linutronix.de>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Daniel Lezcano <daniel.lezcano at linaro.org>
> Cc: Suzuki K Poulose <suzuki.poulose at arm.com>
> Cc: Will Deacon <will at kernel.org>
> ---

May I consider picking this patch or shall it go with the series?

[ ... ]

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