lkml.org 
[lkml]   [2023]   [Oct]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] clocksource/drivers/arm_arch_timer: Initialize evtstrm after finalizing cpucaps
From
On 11/10/2023 11:36, Mark Rutland wrote:
> Hi Daniel,
>
> On Wed, Oct 11, 2023 at 10:30:39AM +0200, Daniel Lezcano wrote:
>> On 07/09/2023 15:34, 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>
>>> ---
>>
>> Applied thanks
>
> This got folded into a larger series that we were hoping to take through the arm64 tree:
>
> https://lore.kernel.org/linux-arm-kernel/20231010103139.3113421-1-mark.rutland@arm.com/
> https://lore.kernel.org/linux-arm-kernel/20231010103139.3113421-2-mark.rutland@arm.com/
>
> I think that won't conflict, since all that's changed is the commit text, but
> it might be worth dropping this patch for now to avoid the risk of a conflict.

Sure, thanks for letting me know. I was suspecting that was the case :)

I've dropped it

--
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

\
 
 \ /
  Last update: 2023-10-11 12:06    [W:0.063 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site