Thread (83 messages) flat view 83 messages, 6 authors, 2018-03-27

Re: [PATCH 01/21] powerpc: Remove warning on array size when empty

From: Mathieu Malaterre <hidden>
Date: 2018-03-01 07:01:35
Also in: lkml

On Thu, Mar 1, 2018 at 3:55 AM, Michael Ellerman [off-list ref] wrote=
:
Mathieu Malaterre [off-list ref] writes:
quoted
When neither CONFIG_ALTIVEC, nor CONFIG_VSX or CONFIG_PPC64 is defined, =
the
quoted
array feature_properties is defined as an empty array, which in turn
triggers the following warning (treated as error on W=3D1):

  CC      arch/powerpc/kernel/prom.o
arch/powerpc/kernel/prom.c: In function =E2=80=98check_cpu_feature_prope=
rties=E2=80=99:
quoted
arch/powerpc/kernel/prom.c:298:16: error: comparison of unsigned express=
ion < 0 is always false [-Werror=3Dtype-limits]
quoted hunk ↗ jump to hunk
quoted
  for (i =3D 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
                ^
cc1: all warnings being treated as errors
Ugh, that's annoying.

This seems to work?
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 4dffef947b8a..5215119e249c 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -291,11 +291,11 @@ static inline void identical_pvr_fixup(unsigned lon=
g node)
 static void __init check_cpu_feature_properties(unsigned long node)
 {
-       unsigned long i;
        struct feature_property *fp =3D feature_properties;
        const __be32 *prop;
+       int i;

-       for (i =3D 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
+       for (i =3D 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp)=
 {
                prop =3D of_get_flat_dt_prop(node, fp->name, NULL);
                if (prop && be32_to_cpup(prop) >=3D fp->min_value) {
                        cur_cpu_spec->cpu_features |=3D fp->cpu_feature;
Indeed that looks like the less invasive solution, I'll re-submit.

Should I resubmit the entire patch series (21 indep patches) or
re-submit only the 3 patches that were discussed (as part of a
different series) ?

Thanks
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