On Wed, Jul 01, 2015 at 09:27:57AM +0200, Jan Kara wrote:
> > +#define bdi_for_each_wb(wb_cur, bdi, iter, start_blkcg_id) \
> > + for ((iter)->next_id = (start_blkcg_id); \
> > + ({ (wb_cur) = !(iter)->next_id++ ? &(bdi)->wb : NULL; }); )
> > +
>
> This looks quite confusing. Won't it be easier to understand as:
>
> struct wb_iter {
> } __attribute__ ((unused));
>
> #define bdi_for_each_wb(wb_cur, bdi, iter, start_blkcg_id) \
> if (((wb_cur) = (!start_blkcg_id ? &(bdi)->wb : NULL)))
But then break or continue wouldn't work as expected. It can get
really confusing when it's wrapped by an outer loop.
Thanks.
--
tejun
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