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

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Date: Tue, 16 Jan 2024 13:06:44 -0800
From: Eric Mackay <eric.mackay@...cle.com>
To: linux@...linux.org.uk
Cc: Jonathan.Cameron@...wei.com, Matteo.Carlini@....com,
        Valentin.Schneider@....com, akpm@...ux-foundation.org,
        anshuman.khandual@....com, catalin.marinas@....com, cl@...ux.com,
        dave.kleikamp@...cle.com, eric.mackay@...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

On Tue, Jan 16, 2024 11:24:18PM +0000, Russell King (Oracle) wrote:
> On Mon, Jan 15, 2024 at 03:59:11PM -0800, Eric Mackay wrote:
> > 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
> 
> I can't find anything that requires the quotes - and as "range" doesn't
> for consistency it seems that default shouldn't either. There's nothing
> in the documentation that indicates quotes should be used, and looking
> at the code, it's just treated as a string. The only thing that quotes
> seem to do is to ensure that whitespace will be included.
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

Ack. I withdraw my nit.