Re: [PATCH 10/19] workqueue: update cwq alignement and make one more flag bit available

David Howells
2009-10-01T13:08:38Z

Tejun Heo <tj@kernel.org> wrote:

> +enum {
> + WORK_STRUCT_PENDING = 0, /* work item is pending execution */
> +
> + /*
> + * Reserve 3bits off of cwq pointer. This is enough and
> + * provides acceptable alignment on both 32 and 64bit
> + * machines.
> + */
> + WORK_STRUCT_FLAG_BITS = 3,
> +
> + WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
> + WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
> +};

There's some great enum abuse going on here:-)

David