On 2/3/24 07:21, Guilherme G. Piccoli wrote: > The number of possible CPUs is set be kernel in early boot time through > some discovery mechanisms, like ACPI in x86. We have a parameter both > in x86 and S390 to override that - there are some cases of BIOSes exposing > more possible CPUs than the available ones, so this parameter is a good > testing mechanism, but for some reason wasn't mentioned so far in the > kernel parameters guide - let's fix that. > > Cc: Changwoo Min <changwoo@xxxxxxxxxx> > Signed-off-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxx> Reviewed-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Thanks. > --- > Documentation/admin-guide/kernel-parameters.txt | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 31b3a25680d0..e553740190ea 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -4644,6 +4644,11 @@ > may be specified. > Format: <port>,<port>.... > > + possible_cpus= [SMP,S390,X86] > + Format: <unsigned int> > + Set the number of possible CPUs, overriding the > + regular discovery mechanisms (such as ACPI/FW, etc). > + > powersave=off [PPC] This option disables power saving features. > It specifically disables cpuidle and sets the > platform machine description specific power_save -- #Randy
