Re: [PATCH 01/31] Add an ERR_CAST() macro to complement ERR_PTR and co. [try #5]

> + * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
> + * @ptr: The pointer to cast.
> + *
> + * Explicitly cast an error-valued pointer to another pointer type in such a
> + * way as to make it clear that's what's going on.
> + */
> +static inline void *ERR_CAST(const void *ptr)
> +{
> +	return (void *) ptr;
> +}

Just to nit, surely you don't need the cast inside the function.  The
casting happens at the call site between the argument and returned pointer.

- z
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