Re: [Xen-devel] [PATCH 2/6] block: don't merge adjacent bvecs to one segment in bio blk_queue_split

[Christoph Hellwig <hch@xxxxxx>]

On Sat, Mar 09, 2019 at 09:37:33AM +0800, Ming Lei wrote:
> For normal filesystem IO, each page is added via blk_add_page(),
> in which bvec(page) merge has been handled already, and basically
> not possible to merge two adjacent bvecs in one bio.
> 
> So not try to merge two adjacent bvecs in blk_queue_split(), also add
> check if one page is mergeable to current bvec in bio_add_page() for
> avoiding to break XEN.

Isn't this two entirely different things?  Both look good to me,
but I don't understand why this is one patch vs two.

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