On Thu, Sep 20, 2012 at 05:47:11PM -0700, Tejun Heo wrote:
> On Mon, Sep 10, 2012 at 05:22:33PM -0700, Kent Overstreet wrote:
> > + bio_for_each_segment_all(bv, bio, i) {
> > + bv->bv_page = alloc_page(gfp_mask);
> > + if (!bv->bv_page) {
> > + while (bv-- != bio->bi_io_vec)
> > + __free_page(bv->bv_page);
>
> I don't know. I feel stupid. I think it's because the loop variable
> changes between loop condition test and actual body of loop. How
> about the following? It is pointing to the member of the same array
> so I think it's not even violating pointer comparison rules.
>
> while (--bv >= bio->bi_io_vec)
> __free_page(bv->bv_page);
I can't remember why I did it that way, but I think I like yours better
- I'll change it.
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