Re: [PATCH v3 03/12] locking/ww_mutex: Extract stamp comparison to __ww_mutex_stamp_after

[zhoucm1]

On 2016å12æ22æ 02:46, Nicolai HÃhnle wrote:
> +static inline bool __sched
> +__ww_ctx_stamp_after(struct ww_acquire_ctx *a, struct ww_acquire_ctx *b)
> +{
> +	return a->stamp - b->stamp <= LONG_MAX &&
> +	       (a->stamp != b->stamp || a > b);
I want to ask a stupid question, why a can compare with b? They are 
pointers of structure. Isn't stamp enough for compare?

Thanks,
David Zhou