Re: [PATCH] zsmalloc: use U suffix for negative literals being shifted

[Matthew Wilcox]

On Sat, Dec 23, 2017 at 09:33:40PM -0500, Nick Desaulniers wrote:
> Fixes warnings about shifting unsigned literals being undefined
> behavior.

Do you mean signed literals?

>  			 */
> -			link->next = -1 << OBJ_TAG_BITS;
> +			link->next = -1U << OBJ_TAG_BITS;
>  		}

I don't understand what -1U means.  Seems like a contradiction in terms,
a negative unsigned number.  Is this supposed to be ~0U?