> +#ifndef CONFIG_STABLE
>       /*
>        * We should return 0 if size == 0 (which would result in the
>        * kmalloc caller to get NULL) but we use the smallest object
> @@ -81,6 +82,7 @@ static inline int kmalloc_index(size_t s
>        * we can discover locations where we do 0 sized allocations.
>        */
>       WARN_ON_ONCE(size == 0);
> +#endif

> +#ifndef CONFIG_STABLE
>       WARN_ON_ONCE(size == 0);
> +#endif

I wonder if there wouldn't be value in making a WARN_*() variant that
contained the ifdef internally so we could lose these tedious
surrounding ifdefs in call sites.  WARN_DEVELOPER_WHEN(), or something.
I don't care what it's called.  

- z 
-
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