From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 11 Sep 2009 22:03:52 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] CONFIG_NR_CPUS is too large
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To: Stephen Sinclair <radarsat1@domain.hid>
Cc: xenomai@xenomai.org

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Stephen Sinclair wrote:
> Hello,
>=20
> I am trying to install Xenomai.  After patching the kernel (I have
> tried with 2.6.29.5 and 2.6.30.5), I get the following error message:
>=20
>=20
> $ make
> scripts/kconfig/conf -s arch/x86/Kconfig
>   CHK     include/linux/version.h
>   CHK     include/linux/utsrelease.h
>   SYMLINK include/asm -> include/asm-x86
>   CC      arch/x86/kernel/asm-offsets.s
> In file included from include/linux/sched.h:62,
>                  from arch/x86/kernel/asm-offsets_64.c:8,
>                  from arch/x86/kernel/asm-offsets.c:4:
> include/linux/ipipe.h:76:2: error: #error "CONFIG_NR_CPUS is too
> large, please lower it."
> make[1]: *** [arch/x86/kernel/asm-offsets.s] Error 1
> make: *** [prepare0] Error 2
>=20
>=20
> The CONFIG_NR_CPUS config variable is set to the default 64, but I
> still get this error if I lower it to 4 or 2.  (This is a dual-core
> machine, AMD X2.)
>=20
> I tried commenting-out this error, just to see what would happen, but
> I get an oops on boot.  Setting the boot flag earlyprintk=3Dvga shows a=

> backtrace, and the crash happens immediately after
> __ipipe_enable_irqdesc, which is in ipipe_virtualize_irq.
>=20
> I don't know how to proceed from here, does anyone know why
> CONFIG_NR_CPUS is triggering this error?

Could you post the .config that fails to build?

Yeah, there is a limitation, normally 96 (IIRC). 2 or 4 CPUs is
definitely far below it.

Jan


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