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    SubjectRe: [BLOCK] phys_contig implies hw_contig
    On Sat, 1 Nov 2003 13:31:27 +1100
    Herbert Xu <herbert@gondor.apana.org.au> wrote:

    > In ll_merge_requests_fn, it is checking blk_hw_contig_segments even if
    > blk_phys_contig_segments succeeds. This means that it may cause two
    > physically contiguous segments to be separated because the hw check
    > fails.

    Your analysis assumes that phys contig implies hw contig, I
    believe it does not. There may be limitations in the VMERGE
    mechanism a platform implements that causes this situation to
    arise.

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