powerpc/prom: Remove warning on array size when empty

When neither CONFIG_ALTIVEC, nor CONFIG_VSX or CONFIG_PPC64 is
defined, the array feature_properties is defined as an empty array,
which in turn triggers the following warning (treated as error on
W=1):

  arch/powerpc/kernel/prom.c: In function ‘check_cpu_feature_properties’:
  arch/powerpc/kernel/prom.c:298:16: error: comparison of unsigned expression < 0 is always false
    for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
                  ^

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 4dffef9..330c65f 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -291,11 +291,11 @@ static inline void identical_pvr_fixup(unsigned long node)
 
 static void __init check_cpu_feature_properties(unsigned long node)
 {
-       unsigned long i;
+       int i;
        struct feature_property *fp = feature_properties;
        const __be32 *prop;
 
-       for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
+       for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) {
                prop = of_get_flat_dt_prop(node, fp->name, NULL);
                if (prop && be32_to_cpup(prop) >= fp->min_value) {
                        cur_cpu_spec->cpu_features |= fp->cpu_feature;