[PATCH: 1/1] sh4: avoid spurious gcc warning

[Michael.Karcher]

Prevent sizeof-pointer-div warning in SH4 intc macros

Gcc warns about the pattern sizeof(void*)/sizeof(void), as it looks like
the abuse of a pattern to calculate the array size. This pattern appears
in the unevaluated part of the ternary operator in _INTC_ARRAY if the
parameter is NULL.

The replacement uses an alternate approach to return 0 in case of NULL
which does not generate the pattern sizeof(void*)/sizeof(void), but still
emits the warning if _INTC_ARRAY is called with a nonarray parameter.

This patch is required for successful compilation with -Werror enabled.

The idea to use _Generic for type distinction is taken from Comment #7
in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108483 by Jakub Jelinek

Signed-off-by: Michael Karcher <kernel@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
---

diff --git a/include/linux/sh_intc.h b/include/linux/sh_intc.h
index c255273b0281..d7a7ffb60a34 100644
--- a/include/linux/sh_intc.h
+++ b/include/linux/sh_intc.h
@@ -97,7 +97,7 @@ struct intc_hw_desc {
     unsigned int nr_subgroups;
 };

-#define _INTC_ARRAY(a) a, __same_type(a, NULL) ? 0 : sizeof(a)/sizeof(*a)
+#define _INTC_ARRAY(a) a, sizeof(a)/(_Generic((a), typeof(NULL): 
0xFFFFFFFFU, default: sizeof(*a)))

 #define INTC_HW_DESC(vectors, groups, mask_regs,    \
              prio_regs,    sense_regs, ack_regs)    \