[Buildroot] Newbie: linux kernel config

[Buildroot] Newbie: linux kernel config

[Williams]

Hi,

I have multicore machines with greater than 8 CPUs

I would like to support more than the default 8 CPUs  (i.e.  CONFIG_NR_CPUS=8)

When I run make linux-xconfig  and search for the following parameter "X86_BIGSMP"; unable to set.
The search/find actually discovers  "X86_BIGSMP" and gives a description only. :(



Support for big SMP systems with more than 8 CPUs (X86_BIGSMP)

CONFIG_X86_BIGSMP:

This option is needed for the systems that have more than 8 CPUs

Symbol: X86_BIGSMP [=n]
Type : boolean
Prompt: Support for big SMP systems with more than 8 CPUs
Location:
-> Processor type and features
Defined at arch/x86/Kconfig:330
Depends on: X86_32 [=n] && SMP [=y]



How can I find and set this parameter?
Or should I just select  "CONFIG_MAXSMP"  and call it a day?


Thanks in advance for your help.



Cheers,
Ernesto

[Buildroot] Newbie: linux kernel config

[Thomas Petazzoni]

Hello,

Your question is off-topic: it's not a Buildroot question, but a kernel
question. I'll nonetheless try to give a hint, but please use the
appropriate mailing list for questions.

On Wed, 21 Jan 2015 17:26:00 +0000, Williams Jr., Ernest L. wrote:

> Symbol: X86_BIGSMP [=n]
> Type : boolean
> Prompt: Support for big SMP systems with more than 8 CPUs
> Location:
> -> Processor type and features
> Defined at arch/x86/Kconfig:330
> Depends on: X86_32 [=n] && SMP [=y]

See this last line? This option only exists on x86 32 bits systems, and
most likely you are building a x86 64 bits system.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com