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

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Message-Id: <20240115235911.80586-1-eric.mackay@oracle.com>
Date: Mon, 15 Jan 2024 15:59:11 -0800
From: Eric Mackay <eric.mackay@...cle.com>
To: cl@...ux.com
Cc: linux@...linux.org.uk, Jonathan.Cameron@...wei.com, Matteo.Carlini@....com,
        Valentin.Schneider@....com, akpm@...ux-foundation.org,
        anshuman.khandual@....com, catalin.marinas@....com,
        dave.kleikamp@...cle.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, robin.murphy@....com,
        vanshikonda@...amperecomputing.com, yang@...amperecomputing.com
Subject: Re: [PATCH] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512

Whitespace issues aside, I have applied the patch on top of kernel 6.1.55 and tested on both a dual-socket Ampere Altra machine with < 256 CPUs, and a dual-socket AmpereOne machine with > 256 CPUs. Works as expected, with all CPUs visible and functional.

>   config NR_CPUS
>   	int "Maximum number of CPUs (2-4096)"
>   	range 2 4096
> - 	default "256"
> + 	default 512

Nit: the new default value should be in quotation marks, if we want to be pedantic

Tested-by: Eric Mackay <eric.mackay@...cle.com>