Re: [PATCH] slab: Redefine ZERO_SIZE_PTR to include ERR_PTR range

[Christopher Lameter <cl@xxxxxxxxx>]

On Thu, 10 Oct 2019, Shyam Saini wrote:

> This will help error related to ERR_PTR stand out better.

Maybe make ZERO_SIZE_PTR an ERRNO value instead? Then allow ERR_PTRs to be
used instead of ZERO_SIZE_PTRs

ERRNO_ZERO_OBJECT

or something like that?

>   */
> -#define ZERO_SIZE_PTR ((void *)16)

#define ZERO_SIZE_PTR ((void *)-ERRNO_ZERO_OBJECT)

> +
> +#define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) - 1 >= \
> +		(unsigned long)ZERO_SIZE_PTR - 1)

And call this something different?