linux-kernel - Re: [PATCH 2/2] powerpc/powernv : Disable subcore for UP configs

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Date:	Fri, 06 Jun 2014 11:22:11 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] powerpc/powernv : Disable subcore for UP configs

On 06/05/2014 08:54 PM, Shreyas B. Prabhu wrote:
> Build throws following errors when CONFIG_SMP=n
> arch/powerpc/platforms/powernv/subcore.c: In function ‘cpu_update_split_mode’:
> arch/powerpc/platforms/powernv/subcore.c:274:15: error: ‘setup_max_cpus’ undeclared (first use in this function)
> arch/powerpc/platforms/powernv/subcore.c:285:5: error: lvalue required as left operand of assignment
> 
> 'setup_max_cpus' variable is relevant only on SMP, so there is no point
> working around it for UP. Furthermore, subcore.c itself is relevant only
> on SMP and hence the better solution is to exclude subcore.c for UP builds.
> 
> Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com>
> ---
> This patch applies on top of ben/powerpc.git/next branch
> 
>  arch/powerpc/platforms/powernv/Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
> index 4ad0d34..636d206 100644
> --- a/arch/powerpc/platforms/powernv/Makefile
> +++ b/arch/powerpc/platforms/powernv/Makefile
> @@ -1,9 +1,9 @@
>  obj-y			+= setup.o opal-takeover.o opal-wrappers.o opal.o opal-async.o
>  obj-y			+= opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
>  obj-y			+= rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
> -obj-y			+= opal-msglog.o subcore.o subcore-asm.o
> +obj-y			+= opal-msglog.o subcore-asm.o
> 

subcore-asm.o can also move down here as well ?

> -obj-$(CONFIG_SMP)	+= smp.o
> +obj-$(CONFIG_SMP)	+= smp.o subcore.o

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