linux-kernel - Re: [PATCH v3] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512

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Date: Wed, 13 Mar 2024 21:18:43 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: "Christoph Lameter (Ampere)" <cl@...ux.com>
Cc: Sudeep Holla <sudeep.holla@....com>, Catalin Marinas
	<catalin.marinas@....com>, Mark Rutland <mark.rutland@....com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "Rafael J. Wysocki"
	<rafael@...nel.org>, Viresh Kumar <vireshk@...nel.org>, Will Deacon
	<will@...nel.org>, Jonathan.Cameron@...wei.com, Matteo.Carlini@....com,
	Valentin.Schneider@....com, akpm@...ux-foundation.org,
	anshuman.khandual@....com, Eric Mackay <eric.mackay@...cle.com>,
	dave.kleikamp@...cle.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux@...linux.org.uk,
	robin.murphy@....com, vanshikonda@...amperecomputing.com,
	yang@...amperecomputing.com, Nishanth Menon <nm@...com>, Stephen Boyd
	<sboyd@...nel.org>
Subject: Re: [PATCH v3] ARM64: Dynamically allocate cpumasks and increase
 supported CPUs to 512

On 13.03.2024 17:39, Christoph Lameter (Ampere) wrote:
> On Wed, 13 Mar 2024, Marek Szyprowski wrote:
>
>>> I did try to trigger this on FVP by adding OPPs + some hacks to add 
>>> dummy
>>> clock provider to successfully probe this driver. I couldn't hit the 
>>> issue
>>> reported 🙁. It could be that with the hardware clock/regulator 
>>> drivers, it
>>> take a different path in OPP core.
>>
>> I can fully reproduce this issue on Khadas VIM3 and Odroid-N2 boards.
>> Both Meson A311D SoC based.
>
> Hmm... Would it trigger on Orangepi5plus? With some effort I can get 
> that board up at home.
>
> Could you reboot with some memory diagnostics so that we are sure that 
> nothing gets corrupted?
>
> F.e. specify a command line parameter "slub_debug" to enable 
> redzoning. That way we may see potential memory corruption.

I've added CONFIG_SLUB_DEBUG_ON=y to my .config, but I got no reports 
for any potential memory corruption.


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland