[dpdk-dev] [PATCH] eal/stack: fix 'pointer-sign' warning

[Eads, Gage]

> clang raise 'pointer-sign' warnings in __atomic_compare_exchange when
> passing 'uint64_t *' to parameter of type 'int64_t *' converts between
> pointers to integer types with different sign.
> 
> Fixes: 7e6e609939a8 ("stack: add C11 atomic implementation")
> 
> Signed-off-by: Phil Yang <phil.yang at arm.com>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> 
> ---
>  lib/librte_stack/rte_stack_lf_c11.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/librte_stack/rte_stack_lf_c11.h
> b/lib/librte_stack/rte_stack_lf_c11.h
> index a316e9a..e3b9eff 100644
> --- a/lib/librte_stack/rte_stack_lf_c11.h
> +++ b/lib/librte_stack/rte_stack_lf_c11.h
> @@ -97,7 +97,7 @@ __rte_stack_lf_pop_elems(struct rte_stack_lf_list *list,
>  	return NULL;
>  #else
>  	struct rte_stack_lf_head old_head;
> -	uint64_t len;
> +	int64_t len;

This works, but I'd prefer to keep 'len' unsigned. How about changing the definition of 'len' in struct rte_stack_lf_list to uint64_t, and in rte_stack_lf_generic.h casting it to rte_atomic64_t* when its address is passed to the rte_atomic64_...() functions?