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    Subject[PATCH 1/2] bio: define __BIOVEC_PHYS_MERGEABLE
    Define __BIOVEC_PHYS_MERGEABLE as the default implementation of
    BIOVEC_PHYS_MERGEABLE, so that its available for reuse within an
    arch-specific definition of BIOVEC_PHYS_MERGEABLE.

    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    Cc: Jens Axboe <jens.axboe@oracle.com>
    ---
    include/linux/bio.h | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    ===================================================================
    --- a/include/linux/bio.h
    +++ b/include/linux/bio.h
    @@ -221,12 +221,16 @@
    #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
    #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)

    +/* Default implementation of BIOVEC_PHYS_MERGEABLE */
    +#define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
    + ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
    +
    /*
    * allow arch override, for eg virtualized architectures (put in asm/io.h)
    */
    #ifndef BIOVEC_PHYS_MERGEABLE
    #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
    - ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
    + __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
    #endif

    #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \



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