[PATCH 2/4] powerpc: Panic on platform ppc-xicp when CONFIG_XICS not set instead of build failure

[Mel Gorman <mel@csn.ul.ie>]

If CONFIG_XICS is not set but CONFIG_PPC_PSERIES is, then the kernel
fails to build with

arch/powerpc/platforms/pseries/smp.c: In function ‘smp_init_pseries_xics’:
arch/powerpc/platforms/pseries/smp.c:202: error: ‘pSeries_xics_smp_ops’ undeclared (first use in this function)
arch/powerpc/platforms/pseries/smp.c:202: error: (Each undeclared identifier is reported only once
arch/powerpc/platforms/pseries/smp.c:202: error: for each function it appears in.)
make[2]: *** [arch/powerpc/platforms/pseries/smp.o] Error 1

As CONFIG_XICS is not always necessary, this patch allows the kernel to
build but the system will panic at runtime if it is found that XICS is
required.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
---
 arch/powerpc/platforms/pseries/smp.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c
index 440000c..da78ea5 100644
--- a/arch/powerpc/platforms/pseries/smp.c
+++ b/arch/powerpc/platforms/pseries/smp.c
@@ -199,7 +199,11 @@ void __init smp_init_pseries_mpic(void)
 
 void __init smp_init_pseries_xics(void)
 {
+#ifdef CONFIG_XICS
 	smp_ops = &pSeries_xics_smp_ops;
+#else
+	panic("Support for platform ppc-xicp not configured");
+#endif
 
 	smp_init_pseries();
 }
-- 
1.6.5