powerpc/powernv : Disable subcore for UP configs

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 itself is relevant only
on SMP and hence the better solution is to exclude subcore.o and
subcore-asm.o for UP builds.

Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 4ad0d345bc960eeec309848c4edc0e2fa23e6970..d55891f89a2ce2bf0c14b22b47564760dd16abf0 100644 (file)
--- 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
 
-obj-$(CONFIG_SMP)      += smp.o
+obj-$(CONFIG_SMP)      += smp.o subcore.o subcore-asm.o
 obj-$(CONFIG_PCI)      += pci.o pci-p5ioc2.o pci-ioda.o
 obj-$(CONFIG_EEH)      += eeh-ioda.o eeh-powernv.o
 obj-$(CONFIG_PPC_SCOM) += opal-xscom.o