For every valid ARRAY_SIZE() use sparse warns about
"cannot size expression". This is somewhat annoying, because code is OK.
$ cat 1.c
#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
int f(void)
{
int a[42];
return ARRAY_SIZE(a);
}
$ sparse 1.c
1.c:9:9: error: cannot size expression
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