Messages in this thread | | | Subject | Re: [PATCH 1/5] x86/smpboot: Add the missing description of possible_cpus | From | Dou Liyang <> | Date | Wed, 21 Mar 2018 13:33:24 +0800 |
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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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