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


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