Messages in this thread | | | Date | Tue, 8 May 2007 17:41:59 -0700 | From | Andrew Morton <> | Subject | Re: [2.6.22 PATCH 22/26] dm: bio list helpers |
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On Tue, 8 May 2007 20:48:45 +0100 Alasdair G Kergon <agk@redhat.com> wrote:
> +#define BIO_LIST_INIT { .head = NULL, .tail = NULL } > + > +#define BIO_LIST(bl) \ > + struct bio_list bl = BIO_LIST_INIT
BIO_LIST is a strange name for something which initialises storage.
> static inline void bio_list_init(struct bio_list *bl) > { > bl->head = bl->tail = NULL; > } > > +#define bio_list_for_each(bio, bl) \ > + for (bio = (bl)->head; bio && ({ prefetch(bio->bi_next); 1; }); \ > + bio = bio->bi_next) > +
I have this vague memory from a long time ago that one particular CPU type wants to go oops when prefetching from an invalid address.
Maybe that went away for some reason - we'd have hit it again if it was real.
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