[PATCH v2] cpufreq, powernv: Fix build failure on UP

[PATCH v2] cpufreq, powernv: Fix build failure on UP

[Srivatsa S. Bhat]

Paul Gortmaker reported the following build failure of the powernv cpufreq
driver on UP configs:

drivers/cpufreq/powernv-cpufreq.c:241:2: error: implicit declaration of
function 'cpu_sibling_mask' [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[3]: *** [drivers/cpufreq/powernv-cpufreq.o] Error 1
make[2]: *** [drivers/cpufreq] Error 2
make[1]: *** [drivers] Error 2
make: *** [sub-make] Error 2

The trouble here is that cpu_sibling_mask is defined only in <asm/smp.h>, and
<linux/smp.h> includes <asm/smp.h> only in SMP builds.

So fix this build failure by explicitly including <asm/smp.h> in the driver,
so that we get the definition of cpu_sibling_mask even in UP configurations.

Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
---

 drivers/cpufreq/powernv-cpufreq.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 9edccc6..af49688 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -29,6 +29,7 @@
 
 #include <asm/cputhreads.h>
 #include <asm/reg.h>
+#include <asm/smp.h> /* Required for cpu_sibling_mask() in UP configs */
 
 #define POWERNV_MAX_PSTATES	256