Re: [PATCH 1/5] x86/smpboot: Add the missing description of possible_cpus

[Dou Liyang]

Hi Peter,

At 03/20/2018 08:37 PM, Peter Zijlstra wrote:
> On Tue, Mar 20, 2018 at 07:04:28PM +0800, Dou Liyang wrote:
>
> > +	possible_cpus=	[s390,x86_64] Use this to set hotpluggable cpus.
> > +			This option sets possible_cpus bits in cpu_possible_map.
> > +			Thus keeping the numbers of bits set constant even if
> > +			the machine gets rebooted.
>
> That description, esp. the last sentence, doesn't make any kind of sense
> to me. What?

Ah, sure enough, I can't be lazy. :-) I stole that from the commit
 3b11ce7f542e ("x86: use possible_cpus=NUM to extend the possible cpus 
allowed")

How about:

possible_cpus=	[s390,x86_64] Set the number of possible CPUs which
		are determined by the ACPI tables MADT or mptables by
		default. possible_cpus=n : n >= 1 enforces the possible
		number to be 'n'.
		While nr_cpus is also be set: nr_cpus=m, choice the
		minimum one for the number of possible CPUs.

Thank,
	dou