linux-kernel - [PATCH v2 01/21] powerpc: Remove warning on array size when empty

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Date:   Fri,  2 Mar 2018 20:49:18 +0100
From:   Mathieu Malaterre <malat@...ian.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Christophe LEROY <christophe.leroy@....fr>,
        Mathieu Malaterre <malat@...ian.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/21] powerpc: 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):

  CC      arch/powerpc/kernel/prom.o
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 [-Werror=type-limits]
  for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
                ^
cc1: all warnings being treated as errors

Suggested-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
 arch/powerpc/kernel/prom.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 4dffef947b8a..330c65f04820 100644
--- 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;
-- 
2.11.0